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The Classification and Analysis of 300 Cycling Crashes that Resulted in Visits to Hospital Emergency.. Frendo, Theresa 2010

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THE CLASSIFICATION AND ANALYSIS OF 300 CYCLING CRASHES THAT RESULTED IN VISITS TO HOSPITAL EMERGENCY DEPARTMENTS IN TORONTO AND VANCOUVER.ByTHERESA FRENDOB.Sc with Honours, University of British Columbia, 2010A THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFBACHELOR OF SCIENCE (HONOURS)inTHE FACULTY OF SCIENCE(Environmental Sciences)This thesis conforms to the required standard………………………………………SupervisorTHE UNIVERSITY OF BRITISH COLUMBIA(Vancouver)APRIL 2010© Theresa Frendo, 2010iiABSTRACTAlthough many benefits of cycling exist, the injuries often deter people from this sustainable mode of transportation.  As part of the Bicyclists’ Injuries and Cycling Environment study, interviews were conducted with 300 injured cyclists who visited the emergency department of one of 5 hospitals in Toronto or Vancouver.  This paper classifies the crashes based on their circumstances and analyzes selected characteristics with a particular interest in city and demographic comparisons. Crashes were broadly classified as collisions (72%) or falls (28%)and as involving motor-vehicles (48.3%) or not. Injured cyclists in Toronto more frequentlycollided with streetcar tracks (Odds Ratio: 21.0) or vehicle doors (OR: 3.96), and less frequently collided with pedestrians or animals (OR: 0.29) than those in Vancouver.  In a multiple logistic regression model comparing the odds of a crash being a collision versus a fall, collisions were more common in Toronto (OR: 3.50) than Vancouver, on trips to work or school (OR: 4.66) than trips for other purposes, and for injured females (OR: 1.69) than injured males. In a second model, motor-vehicle involvement was found to be more common among injured cyclists less than 30 years old (OR: 2.00) than those who were older, and on trips to work or school (OR: 2.89) than for other purposes. The use of drugs or alcohol was not significantly related to the crash circumstances. Variations in crash circumstancesbetween cities suggest that modification of infrastructure could improve safety and increase the number of cyclists.iiiTABLE OF CONTENTSTITLE PAGE ………………………………………………………………………….............iABSTRACT………………………………………………………………………………......iiTABLE OF CONTENTS…………………………………………………………….............iiiLIST OF FIGURES…………………………………………………………………………..iv LIST OF TABLES………………………………………………………………………....….v LIST OF APPENDICES…………………………………………………………………...…viACKNOWLEDGEMENTS………………………………………………………………….viiINTRODUCTION…………………………………………………………………………….8Active Transport………………………………………………………………………..…8Ridership and the Need for Safety Assessment…………………………………………...8Previous Cycling Injury Studies and Classifications…………………………………..… 9Purpose …………………………………………………………………………………..10METHODS ……………………………………………………………………………….…11Bicycle Crash Classification …………………………………………………………….11Data Analysis …………………………………………………………………………....22RESULTS……………………………………………………………………………………25Bicycle Crash Classification ….…………………………………………………………25Outcome Variables…………………………………………………………………25Descriptive Variables….…………………………………………….……..………28Data Analysis ….……………………………………………………………………...…30Descriptive Variables………………………………………………………………30Primary Circumstance……………………………………………………………...33Motor-vehicle Involvement…..……………………………………………………37Cross-tabulations…………………………………………………………………...38Logistic Regression………………………………………………………………...41DISCUSSION & CONLUSIONS…………………………………………………………...43Justification of the Bicycle Crash Classification Scheme………………………………..43Discussion of the Analysis……………………………………………………………….43Strengths and Limitations…..……………………………………………………………45Conclusions……………………………………………………………………………....45REFERENCES CITED………………………………………………………………………46APPENDIX A……………………………………………………………………………..…49ivLIST OF FIGURESFigure 1:  Question numbers repeatedly used in classification systems…………………….19Figure 2:  Flowchart of categories within primary circumstance……………………………25Figure 3: Age distribution of cyclists in Toronto and Vancouver…………………………...32Figure 4:  Variations in the purpose of bicycle trips in Toronto and Vancouver……………33Figure 5:  Percentage of cycling crashes within each category of primary circumstance…...34  Figure 6: Primary Circumstance: Toronto vs. Vancouver…………………………………...36Figure 7: Primary Circumstance: Motor-vehicle Involvement……………………………...37vLIST OF TABLESTable 1:  Classification systems reviewed …………………………………………………..12Table 2:  Variables within each classification system and their location in our dataset …….13Table 3:  Independent variables and their sources in the dataset ……………………………20Table 4:  Outcome variables…………………………………………………………………21Table 5:  Gender, age, foreign substance use, and trip purpose in Toronto and Vancouver...31Table 6: Number of crashes in each category of Primary Circumstance, in Toronto and Vancouver…………………………………………………………………………………....35Table 7:  Motor-vehicle involvement within each category of Primary Circumstance……...38Table 8:  Cross-tabulations of outcome variables with city………………………………….39Table 9:  Cross-tabulations of simplified-category descriptive variables with Primary Circumstance..………………………………………………………………………………..40Table 10:  Cross-tabulations of simplified-category descriptive variables with Motor-vehicle Involvement………………………………………………………………………………….41  Table 11:  Logistic Regression Results for Primary Circumstance—Collision……………..42  Table 12:  Logistic Regression Results for Motor-vehicle Involvement………………….....42  viLIST OF APPENDICESAppendix A:  Portion of the Interview used in this Study……………………………………49viiACKNOWLEDGEMENTSThis research was supported in part by the Canadian Institute of Health Research (CIHR) and the Heart and Stroke Foundation of Canada.  I would like to thank the Bicyclists’ Injuries and Cycling Environment (BICE) project staff, investigators, and participants, for their contributions to this study, and extend a special thanks to my thesis supervisor, Kay Teschke, and Meghan Winters in the School of Population and Public Health at the University of British Columbia, for their guidance and feedback throughout the project.8INTRODUCTIONI was riding westbound on College at Bathurst. I stopped at the intersection for the red light. The light turned green. There was an SUV with a trailer turning right at the same time that I was proceeding through the light. I didn’t see the trailer until I was underneath it being dragged. (Sequential# 1004)The risks associated with cycling in cities often become apparent by more painful means than necessary.  By reducing the rate of bicycle crashes like the one described above, it is anticipated that a concurrent decrease in the risks associated with cycling in cities will result in an increase in the number of people that cycle, both as a means of transportation as well as for recreation.Active TransportBicycling, in all its forms, is an important factor in maintaining a healthy society.  Not only does it provide health benefits on the individual level, but cycling also contributes to the health of the greater public.  On the individual level, both physical and mental health benefits are associated with cycling (Cavill & Davis, 2007), including a decreased rate of obesity (Lindstrom, 2008; Wen & Rissel, 2008; Gordon-Larsen et al., 2005) and a reduced risk of diseases, such as cardiovascular disease (Gordon-Larsen et al., 2009; Hammer & Chida, 2008).  The greater health of the public is also enhanced by bicycling; these improvements include a decrease in the economic costs associated with physical inactivity (Katzmaryzyk & Janssen, 2004), as well as many environmental benefits, typically associated with bicycling as a form of active transportation, which include decreased noise, traffic congestion, and air pollution, including reduced greenhouse gas emissions (Pucher & Dijkstra, 2003; Boogaard et al., 2009).Ridership and the Need for Safety Assessment The benefits of cycling support the argument that ridership should be encouraged as an urban mode of transportation alternative to the automobile.  Although cycling-injury rates have decreased in recent years, the risks of cycling continue to deter people from cycling as a 9mode of transport (Winters et al., 2010).  It is estimated that 7,500 cyclists are seriously injured in Canada each year, with fatalities ranging from 40 to 70 (Transport Canada, 2005). Such statistics suggest that an investment in bicycle-specific infrastructure might be valuable in decreasing injury-crashes. However, the current literature on injuries and cycling infrastructure does not include assessment of all types of bicycling facilities; for example some studies focusing on straightaways will categorize many types into a few categories, which fail to distinguish the possible variations in risk associated with each type (Reynolds et al., 2009).   It is important that research continues with more specific classifications in order to establish which factors increase the rate and severity of injury crashes.  This information will then be available for application when determining the type and style of infrastructure that should be built. Previous Cycling Injury Studies and Classifications Many studies have been conducted that examine bicycle crashes and the injuries thatresult.  These include studies of the types of injury that can result (Finch et al., 1998), as well as the patterns and repetitions within these cycling injuries.  To take it a step further, such injury research is often cross-tabulated with data on helmet use (Miamaris et al., 1994; Robinson, 2004).  Other studies include analysis of more variables, such as injury severity, common pre-crash scenarios, and physical setting (USDOT, 2002), but not a categorical classification of the crashes studied.  Some previous research has broadened their reports from merely summarizing factors that lead to cycling crashes to the development of classification systems for bicycle crashes or injuries. Examples of crash classification systems include the classification of bicycle-motor vehicle accidents into ten categories that describe the orientation of both vehicles (Lott & Lott, 1976).  A more specific classification of bicycle-motor vehicle crashes defines each as one of 34 “crash-types”, each of which is accompanied by a sketch for proper classification (Tan, 1995).  However, few studies have been done that classify a comprehensive sampling of bicycle crashes; one that is not specific to those that involvemotor-vehicles and includes the presence of other factors that may contribute to a crash.  A study incorporating all of these variables could provide useful information to many, including municipalities attempting to improve their cycling infrastructure. 10PurposeThe purpose of this study was to develop a classification system for bicycle crashes that is applicable to a wide variety of bicycle crashes. The classifications include multiple influencing factors that contributed to the occurrence of crashes, so as to present areas that need to be addressed to increase safety.  This classification system was developed through the study of 300 cycling crashes that resulted in visits to hospital emergency rooms in Toronto and Vancouver. The primary circumstances behind these crashes were determined and cross-tabulated with multiple independent variables, such as trip purpose, age, and location. By categorizing the injury crash data, results regarding the situations with the highest numbers of cyclist injury crashes were established.  This information could be used for determining areas that require further assessment and application of injury prevention tactics with the overall intention of improving bicycle safety and increasing ridership. 11METHODSThe study of Bicyclists' Injuries and the Cycling Environment (“the BICE study”) is an ongoing study in the School of Population and Public Health at the University of British Columbia, which has set out to examine cycling routes and determine the characteristics that are associated with variations in injury rates.  Interviews were conducted of over 600 adult cyclists (≥19 years old) who had attended emergency departments for treatment of an injurysustained while cycling.  It was required that the bicycle crashes occurred in the city in which they were treated and that the cyclists also resided in that city. The interview included information regarding a description of the injury crash, identification of route and crash site, cycling experience, demographics, and other characteristics of the trip, such as the use of personal safety devices.The information collected from the first 300 injured cyclists was data-entered in time for this sub-study.  The resulting dataset included 150 cyclists from Toronto who attended the emergency department at St. Michael’s Hospital, Toronto General Hospital, or Toronto Western, as well as 150 cyclists from Vancouver who attended the emergency department atSt. Paul’s Hospital or Vancouver General Hospital.  This dataset was used to develop a classification scheme for the bicycle crashes and to conduct an initial analysis of some of theinformation collected. (For a copy of the portion of the interview used see Appendix A).ClassificationThe classification of the 300 cycling crashes was informed by a literature review.  Other systems and their categories of classification were reviewed with a particular interest in those that classified crash circumstances or injury mechanisms.  Table 1 was constructed to compare these classification systems, which allows for a simple comparison of their structures and the variables they classify.  Table 2 links the variables used in other classification schemes to our data by showing the interview questions that reflect similar information. In addition, this link of classifiable variables to interview questions established the location of the information in our data. Table 2 was used to produce Figure 1, which summarizes the frequency of our information used in the other classification systems, by systematically linking the categories 12Table 1: Classification systems reviewed in order to determine which variables should be included in our classification of cycling injury-crashes.System Source Variables Classified Structure of ClassificationAdditional InformationOccupational Injury and Illness Classification Manual (OIICM)U.S. Department of Labor, Bureau of Labor Statistics (1992).-  Nature of Injury or     Illness-  Part of Body Affected-  Source of Injury or     Illness-  Event or Exposure,       e.g.: - contact with                 other objects             - falls-  Secondary Source of   Injury or Illness-  Category (symbol) -  Divisions (0)-  Major group (00*)-  Minor group (000*)Source of injury: 8 Vehicles83* highway vehicle, non-motorized831* Animal or human powered vehicle8312 BicycleInternational Classification of External Causes of Injuries (ICECI)(Version 1.2) ICECI Coordination and Maintenance Group (2004). Consumer Safety Institute, Amsterdam and AIHW National Injury Surveillance Unit, Adelaide.Core Module: -  Intent-  Mechanism of injury-  Object/substance     producing injury -  Place of occurrence-  Activity when injured -  Alcohol, psychoactive    drug, or substance useModule (character) --Core: overview, applicable to all injuries*Additional modules: specific to injury Each module includes: -  elements (numerical) -  code: categories        (numerical)  -  inclusions/exclusions      (decimal)Sport Module (S) of particular interest: Elements:S1: Type of sport/   exercise activityS2: Phase of activity S3: Personal counter   measures S4: Environmental   counter measuresTen classes of Bicycle-automobile accidents in Davis, CALott, D.F. and D.Y. Lott (1976). Effect of Bike Lanes on Ten Classes of…J Safe Res vol. 8 (4), pg 171 – 179.Accident type: proximal causes Simply ten categories(single variable system)Examples:1. Cyclist failed to stop/yield at controlled intersection                     2.  Motorist collided with rear of vehicleCrash-Type ManualTan, S. 1995 University of North Carolina Highway Safety Research Center. For the U.S. Department of Transport. -  precipitating actions- predisposing factors-  characteristic     populations and/or     locationDescribing title Accommodated by an illustration showing the crash situationExamples:-  Ride out at driveway,     stop sign, etc.-  Trapped-  Overtaking-  Multiple threatAnalysis of pedacyclist crashesUSDOT analysis of pedacyclist crashes, 2002. -  pre-crash scenario  -  severity         -  age involvement     (driver & cyclist)-  physical setting -  contributing factorseach variable includes descriptive analysis, pie charts. (No systematic classification)some statistics on fatalitiesFactors in the Initiation of Bicycle-vehicle CollisionsWilliams, A.F. (1976). Am J Dis Child, vol. 130, pg 370 – 377.-  motion of bicycle-  motion of vehiclecategorized probable responsibility based on movement of bicycle and vehicleExamples: -  vehicle driving wrong may in lane or road-  ran stop sign-  emerged from driveway, ally, parking lot, etc.  13Table 2:  Variables within each classification system and their location in our dataset.  Not applicable (n/a) means that the information was not found anywhere in our dataset. System Variables Categories Source in our dataset Question#(response)ICECI—SportModuleType (17 : wheeled, non-motor sports).01 BMX 25 (9).02 mountain 25 (3).03 road 25 (2).04 track/ velodrome 25 (4).05 other specified 25.06 unspecified 25Phase 1. Training 23 (6)2. pre-event no3.Warm-up no4.Competition 23 (6)5. cool down no6. post-event no7. recreational participation 23 (6)98. other specified 23 (1-5, 7)99. unspecifiedPersonal Counter equipment1. none 32 (7) no helmet2. braces, orthotics, guards n/a3. taping n/a4.padding n/a5. thermal devices n/a6. splints n/a7. jock n/a8. gloves n/a9. mouth guard n/a10. goggles n/a11. helmet 3212. facemask n/a13. footwear n/a14. PFD n/a98. other specified 29 and 30 (lights)99. other unspecified n/aEnvironmental Counter measures1. none assumed response2. padded surfaces no3. corner padding no4. barrier B215. safety restraints n/a8. other specified B189. unspecified typical responseICECI—Core  ModuleIntent1. Unintentional typical assumed response2. Intentional Self-harm n/a3. Assault n/a4. Other Violence n/a14Table 2 continued.System Variables Categories Source in our dataset Question#(response)ICECI—Core ModulecontinuedIntent continued5. Undetermined intent n/a6. Complications of medical/surgical care n/a8. Other specified intent n/a9. Unspecified Intent n/aMechanism1. Blunt Force 4 (interpretation)2. piercing or penetrating force 4 (interpretation)3. other mechanical force 4 (interpretation)4. Thermal Mechanism 4 (interpretation)5. threat to breathing 4 (interpretation)6. Exposure to chemical or other substance 4 (interpretation)7. Physical over-exertion 4 (interpretation)8. exposure to (effect of) weather, natural disaster, or other force of nature 4 (interpretation)20. Complication of health care 4 (interpretation)98. Other specified mechanism of injury 4 (interpretation)99. Unspecified mechanism of injury 4 (interpretation)Object/ substance producing Injury1. Land vehicle or means of land transport 5.12. Mobile machinery or special purpose vehicle 4 interpretation3. watercraft or means of water transport n/a4. aircraft or means of air transport n/a5. furniture/ furnishing n/a6. Infant or child product 4 interpretation7. appliance mainly used in household n/a8. utensil or container n/a9. item mainly for personal use n/a10. equipment mainly used for sports/ recreational activitytypical assumed response11. tool, machine, apparatus mainly used for work-related activity 4 interpretation 12. weapon n/a13. animal, plant, or person 5.114.  building, building component or related fitting 5.115. ground surface or surface conformation 5.116. material NEC n/a17. Fire, flame or smoke n/a18. hot object/substance NEC n/a19. food or drink n/a20. pharmaceutical substance for human use, e.g. drug, medicine 3421. non pharmaceutical chemical substance 3440. medical/ surgical device n/a98. Other specified object/substance 4 (interpretation) 99. Unspecified  4 (interpretation) 15Table 2 continued.System Variables Categories Source in our dataset Question#(response)ICECI—Core ModulecontinuedPlace of Occurrence1. Home n/a2. Residential institution n/a3. medical service area n/a4. school, education area n/a5. sport and athletics area n/a6. transport area: public highway, street or road 6.27. transportation area: other 6.28. industrial or construction area B 219. farm or other place of primary production n/a10. recreational area, cultural area, or public building 1111. commercial area (non-recreational) n/a12. countryside n/a98. other specified place of occurrence 1199. unspecified place of occurrence n/aActivity when injured1. paid work 23.32. unpaid work 233. education 234. sports and exercise during leisure time 23.65. leisure or play 23.66. vital activity n/a7. being taken care of n/a8. travelling 23.1/ .298. other specified activity 2399. unspecified activity 23Alcohol use1. no information available 34.2 (9)2. no suspicion or evidence of alcohol use by any person involved in the injury event 34.2 (0)3. suspicion or evidence of alcohol use by the injured person 34.2 (1)4 suspicion or evidence of alcohol use by other persons involved in the injury event n/a5. suspicion or evidence of alcohol use by both the injured person and other persons involved in the injury eventn/aPsychoactive drug or substance use1. no information available 34.3/4 (9)2. no suspicion or evidence of psychoactive or other substance use by any person involved injury event34.3/4 (0)3. suspicion or evidence of psychoactive or other substance use by the injured person 34.3/4 (1)4 suspicion or evidence of psychoactive or other substance use by other persons involved in the injury eventn/a16Table 2 continuedSystem Variables Categories Source in our datasetQuestion#(response)ICECI—Core ModulecontinuedPsychoactive drug or substance usecontinued5. suspicion or evidence of psychoactive or other substance use by both the injured person and other persons involved in the injury eventn/aOccupational Injury and Illness Classification Manual (OIICM)Nature of Injury or Illness0 Traumatic Injuries and Disorders n/a1 Systemic Diseases or Disorders n/a2 Infectious and Parasitic Diseases n/a3 Neoplasms, Tumors, and Cancer n/a4 Symptoms, Signs, and Ill-defined Conditions n/a5 Other Conditions or Disorders n/a8 Multiple Diseases, Conditions, or Disorders n/a9999 Nonclassifiable n/aPart of Body Affected0 Head n/a1 Neck, Including Throat n/a2 Trunk n/a3 Upper Extremities n/a4 Lower Extremities n/a5 Body Systems n/a8 Multiple Body Parts n/a9 Other Body Parts n/a9999 Nonclassifiable n/aSource of Injury or Illness0 Chemicals and Chemical Products n/a1 Containers n/a2 Furniture and Fixtures n/a3 Machinery 4 (interpretation)4 Parts and Materials 4 (interpretation)5 Persons, Plants, Animals, and Minerals 4 (interpretation)6 Structures and Surfaces 4 (interpretation)7 Tools, Instruments, and Equipment 4 (interpretation)8 Vehicles 4 (interpretation)9 Other Sources All bicycle9999 Nonclassifiable n/aEvent or Exposure (includes contact with other objects and falls as divisions)0 Contact With Objects and Equipment 5 (1)1 Falls 5 (0)2 Bodily Reaction and Exertion n/a3 Exposure to Harmful Substances or Environments 5.14 Transportation Accidents 5 (all)5 Fires and Explosions n/a6 Assaults and Violent Acts n/a9 Other Events or Exposures n/a9999 Nonclassifiable n/a17Table 2 continuedSystem Variables Categories Source in our datasetQuestion#(response)OIICMcontinuedSecondary Source of Injury or Illnesssee sources of injury 4 (interpretation)Lott and Lott. Ten Classes of bicycle-automobile accidents in Davis, Ca.Movement of cyclist and motorist1. Cyclist exited driveway into motorist path 4/12 (interpretation)2. motorist exited driveway into cyclist path 4/12 (interpretation)3. cyclist failed to stop/yeild at controlled intersection 4/12 (interpretation)4. cyclist made improper left turn 4/12 (interpretation)5. cyclist rode on wrong side of street 4/12 (interpretation)6. motorist collided with rear of cyclist 4/12 (interpretation)7. motorist failed to stop/yield at controlled intersection 4/12 (interpretation)8. motorist made improper left turn 4/12 (interpretation)9. motorist made improper right turn 4/12 (interpretation)10. motorist opened car door into cyclist'spath 4/12 (interpretation)Factors in the initiation of bicycle-vehicle collisions.Movement of vehicleIn motion; other vehicle not in motion 4/12 (interpretation)struck other vehicle from behind 4/12 (interpretation)intersected other vehicle travelling in same direction 11.6 (1)emerged from driveway, alley, parking lot, gas station, etc 4/12 (interpretation)Came onto road from lawn or other non-roadway location and intersected other vehicle4/12 (interpretation)ran through stop or yield sign 4/12 (interpretation)wrong way on one-way street or in lane designated for traffic in opposite direction 11.6 (2)while making a left turn, collided with oncoming vehicle 4 (interpretation)unclassified 4 (interpretation)motion of bicyclebicycle not in motion; motor vehicle in motion 4/12 (interpretation)both bicycle and motor vehicle in motion 4/12 (interpretation)bicycle in motion; motor vehicle not in motion 4/12 (interpretation)USDOT Analysis of pedacyclist crashesPre-crash scenariosvehicle going straight 4/12 (interpretation)vehicle turning right 4/12 (interpretation)vehicle turning left 4/12 (interpretation)vehicle parking 4/12 (interpretation)vehicle backing 4/12 (interpretation)Other 4/12 (interpretation)crossing paths 4/12 (interpretation)parallel paths 4/12 (interpretation)18Table 2 continuedSystem Variables Categories Source in our datasetQuestion#(response)USDOT Analysis of pedacyclist crashescontinuedphysical settingroadway profile/ alignment 6.2.1 /12posted speed limit n/atraffic control device 12relation to roadway 11contributing factors and circumstancesAlcohol/Drugs 34Impaired 34Driver Distracted By n/aDriver Vision Obscured By n/aSpeeding/Reckless Driving 4 (interpretation)Sign/Signal Violation 4 (interpretation)Driver Lost Control 4 (interpretation)Other Violation Charged 4 (interpretation)Hit & Run 4 (interpretation)age involvement age of cyclist 43age of driver n/acrash severity based on an index n/aCrash-Type ManualMotion of bicycleride out at commercial driveway 12 (sketch analysis)ride out at residential driveway 12 (sketch analysis)ride out from sidewalk 12 (sketch analysis)ride out at midblock 12(sketch analysis)ride out at stop sign 12 (sketch analysis)Trapped 12 (sketch analysis)multiple threat 12 (sketch analysis)drive out at midblock 12 (sketch analysis)drive out at stop sign 12 (sketch analysis)Unknown 12 (sketch analysis)right on red 12 (sketch analysis)backing 12 (sketch analysis)drive through 12 (sketch analysis)etc. *37 categories in total; all based on the positioning of the bicycle, vehicle and traffic control devices; accompanied by a drawing12 (sketch analysis)19Question #'s repeatedly used in Clasification Systems456.2111223253443 B 18 B 21320102030405060Question (# labeled on top of bar)# of times usedFigure 1:  Question numbers repeatedly used in classification systems  Shows the number of times the information from each interview question was used in the previous classification systems under review.  A brief summary of the topics of each question are as follows (for entire question including response options see Appendix A): Question 4: free response question describing injury event; Question 5: object of collision; Question 6.2: street/ intersection of crash location; Question 11: specifics on injury site; Question 12: sketch of injury site; Question 23: trip purpose; Question 25: type of bicycle; Question 32: helmet specifics; Question 34: consumption of foreign substances; Question 43: age of cyclist; Question B18: illuminating street lights at crash site; Question B21:construction at crash site.within all the reviewed systems to our dataset.  It was produced to numerically show the prevalence of each variable and ease the decision about which variables to include in our classification. Figure 1 and the interview questions represented by it were critically assessed to determine which variables to include when classifying the 300 cycling crashes in our dataset.  It was established that the following information should be included in the classification of the bicycle crashes: the primary circumstance of the crash; cyclists’ age, gender, and city; the purpose of the bicycle trip; and use of foreign substances prior to the trip. Wit the exception of primary circumstance, all these variables were found directly in our dataset and are summarized in Table 3, as well as defined in the Results (Bicycle Crash Classification) section of the paper.  20Table 3:  Various descriptive variables and their sources in dataset for use in cross-tabulations with the outcome variables. Descriptive Variables Source CategoriesSimplified CategoriesGender Interview Q39 - male- female- male- femaleAge 2009 - Q43 (year of birth) = age- 19-29- 30-39- 40-49- 50-59- 60-69- - 70+- young (<30)- olderForeign substance UseInterview Q34 34.1 on medications34.2 on alcohol34.3 on marijuana34.4 on other recreational drugs- alcohol- marijuana- other recreational drugs- medications- (2 or more)- no substance use- non-prescription substances- medications- no substance useTrip purpose (hierarchy order used as shown)Dataset Q23 o to or from worko to or from schoolo as part of your job (e.g. courier)o for personal business (e.g. shopping)o for social reasons (e.g. visiting friends)o exercise or recreationo other - work commute- school commute- for employment - running errands- for social reasons- exercise - other - work/school- otherCity Hospital: 1. St. Michael’s 2. University Hospital Network (TGH & Toronto Western)3. St. Paul’s4. VGH- Toronto (1 & 2)- Vancouver (3 & 4) - Toronto- VancouverThe other information found in Figure 1 that we have obtained through the interviews was not used in this paper; however, all the information will eventually be analyze within the BICE study.  For example, the presence of street lighting and personal safety devices, such as reflectors, will be part of another analysis.  The primary circumstance of each crash was established by the interpretation of the information from answers to Questions 4, 5, and 5.1 of the interview.  The answer to Question 5 established the first level of classification under primary circumstance by defining 21the crash as either a collision or a fall. Crashes established as “collisions” were further classified into second and third levels of classification by the analysis of responses toQuestion 5.1 (“What did you collide with?”), combined with the interpretations of answers to Question 4 (a free response question based on the cyclist’s description of the injury incident)when the specified “other” responses did not suffice.  Next, those crashes that were not defined as collisions (answers of “no” to Q5) were categorized as “falls”; further levels of classification were determined based on interpretations of the free responses to Question 4.  The categories of primary circumstance established are listed in Table 4 and are individually defined, along with a description of their source in the dataset, in the Results section of this study.  The motor-vehicle involvement in each crash wasalso developed as a separate outcome variable. This was initially established using both the primary circumstance classification, as well as thecyclists’ responses to Question 4.  Each crash was defined as either having a “motor-vehicle involved”, which includes not only collisions or avoidance of a vehicle, but also crash descriptions that mention divergence from the cyclist’spath due to a car.  Crashes that did not mention a specific vehicle in the description were defined by “no motor-vehicle involvement”.  These categories of motor-vehicle involvement are also included in Table 4, and their definitions can also be found in the Results (Bicycle Crash Classification) section of the paper.Outcome Variables Categories Primary Circumstance (levels 1 & 2)COLLISION - Motor vehicleCOLLISION - Person/animalCOLLISION - Infrastructure COLLISION - Cycling surfaceCOLLISION - OtherFALL - collision avoidance FALL - bicycle malfunctionFALL - wheel lodgeFALL - cycling behaviourFALL - no recollectionFALL – otherPrimary Circumstance – Collision vs. Fall- Collision- FallPrimary Circumstance – streetcar or traintracks- Streetcar or train tracks- OtherPrimary Circumstance– vehicle door- Vehicle door- OtherPrimary Circumstance- person/animal- Person/animal- OtherMotor-vehicle Involvement- Motor-vehicle involved- No motor-vehicle involvedTable 4: The categories of the outcome variables to be cross-tabulated with the descriptive variables 22The descriptive, or independent, variables included in the classification of the crashes are also defined and described in the Results (Bicycle Crash Classification) in a systematic manner so that reference to category definitions would be simple.  The categories of each variable were established by studying our dataset and making appropriate categories with careful characterization so that they could be applied to in the classification of other cycling crashes. Data AnalysisIn addition to the development of the classification system, data analysis was conducted to summarize and evaluate our data.  The descriptive variables (gender, age, foreign substance use, and trip purpose) and the outcome variables (primary circumstance and motor-vehicle involvement) were compared between Toronto and Vancouver in order to determine the variations that exist between the two cities.  The second outcome variable,motor-vehicle involvement, was also analyzed to determine its variation in the distribution throughout the bicycle crashes.  The data analysis was conducted with the primary goal of revealing the situations that relate to a high proportion of cycling crashes, and comparing the data to see how crashes vary between the two cities.Cross-tabulations of the descriptive variables in Toronto and Vancouver were conducted using the Statistical Package for the Social Science (SPSS) (SPSS Inc. Chicago, IL: Version 17.0) to determine the differences that exist between the two cities. A comparison of age distributions of the cyclists in Toronto and Vancouver was done by completing a T-test using SPSS.  Descriptive statistics of the age distributions were also calculated including the means, standard deviations and confidence intervals. The statistical significance of variations between city and gender, foreign substance use, or trip purpose wasdetermined via chi-squared analyses using SPSS.After the primary circumstance of each of the 300 cycling crashes was established using the classification scheme developed, the results were displayed in frequency tables and pie charts using Microsoft Office Excel (Excel) (Microsoft. Redmond, WA: 2003).  The 95% confidence interval for the proportion in each category was calculated using the following formula:2395% CI = ±1.96 [(p(1-p))/ n]0.5; where p= number in the category n = sample sizeSimplified forms of the primary circumstance were developed for more comprehensive cross-tabulation between the two cities; these variations of primary circumstance are described in Table 4.  Comparisons between the two cities were made by calculating the odds ratio (OR): the ratio of the odds of a collision being in Toronto versus Vancouver to the odds a fall being in Toronto versus Vancouver. Similar calculations of odds ratios were done for the comparison of motor-vehicle involvement to no motor-vehicle involvement.  The significance of each OR was determined by calculating the 95% confidence interval using the following method:95% CI = e ln RO ˆ ± 1.96  SE )ˆln( RO ; where SE )ˆln( RO =22111111baba The initial analyses examined each independent variable (city, age, gender, foreign substance use, trip purpose) separately. This was followed by the creation of models that incorporated and adjusted for all important independent variables in a single analysis. Thiswas completed via two separate multiple logistic regressions to determine the adjustedinfluence of each significant independent variable on each of the outcome variables: primary circumstance; and motor-vehicle involvement.  In order to determine which independent variables to include in the logistic regression, each descriptive variable was first simplified to have only two categories (except for Foreign Substance Use which required 3) (refer to Table 3 for the simplified categories developed) and then cross-tabulated with each outcome variable, in unadjusted analyses.  The independent variables with statistically significant odds ratios were then used in the logistic regression models.  A binary logistic regression was run using SPSS with the dependent variable of primary circumstance: collisions (1) versus falls (0), and descriptive variables with statistically significant odds ratios as the covariates.  The same type of regression was repeated with the dependent variable being motor vehicle involvement (1) (with no motor-vehicle involvement being the reference (0)) and the appropriate descriptive variables, based 24on significant odds ratios, as covariates.  The results included the coefficient (B value), the standard error (S.E.), and the significance (p-value) of each descriptive variable; the adjusted odds ratios and 95% confidence intervals were then calculated using the formulas:    OR = eB  95% CI = e(B ± 1.96 S.E.)The results of each logistic regression model were displayed in a table and showed the odds of collisions or motor-vehicle involvement under the combined influence of the multiple descriptive variables. 25RESULTSBicycle Crash ClassificationThe categories of classifications used throughout this study are defined below, andthe sources of the information used from the interview conducted are indicated for eash. (See Appendix A for the portion of the interview used). The systematic descriptions are intended to make reference to definitions efficient and to make application of this classification system to future cycling crash studies possible. Outcome Variables (1-2): Category name:  definition (source in our dataset).1. Primary Circumstance: designates the simplest circumstance that led to the bicycle crash; our own method of classification based initially on responses to Question 5 of the Interview, but made more sophisticated by the interpretation of free-response, incident descriptions in Question 4. Figure 2 gives a visual layout of the categories of primary circumstance. Figure 2: Flowchart of the categories within Primary Circumstance.261.1 Collision: a crash initiated by the cyclist coming in contact with another object, including motor vehicle, person, animal, or road hazard. (Question 5, response (1.) “Yes”).1.1.1 Motorized vehicle:  collision with a motor-vehicle1.1.1.1 Automobile:  collision with an automobile, except collision with automobile door(Question 5.1, response of “Car, SUV, pick-up truck, van”)1.1.1.2 Over-sized vehicle:  collision with a large vehicle, including truck, bus, trailer; except collision with over-sized vehicle door (Question 5.1, responses of “Large truck”, “Bus or streetcar” or “other” specified as “trailer”)1.1.1.3 Vehicle  door:  collision with the door of a parallel-parked vehicle; often due to sudden opening (Question 5.1, specified in “Other” responses, or interpreted from free response Question 4)1.1.2 Person or Animal: collision with a person or animal1.1.2.1 Cyclist: collision with another person on a bicycle (Question 5.1, response “bicycle”)1.1.2.2 Pedestrian:  collision with a person on foot (Question 5.1, response “Cyclist”)1.1.2.3 Dog: collision with an animal, all of which were dogs in our study(Question 5.1, response “animal”)1.1.3 Infrastructure:  collision with an obstacle that is of permanent in nature and built by man; fence, curb, barrier, etc.  (Question 5.1, response “Other” specification interpretation including responses of “curb”, “fence”, etc.)1.1.4 Cycling Surface:  collision with an obstacle that is on or in the surface the cyclist is on; often misplaced, requiring maintenance or removal; metal sheets, pot hole, etc. (Question 5.1, response “pot hole” and “Other” specification interpretation including responses of “metal plates” and “debris”).1.1.4.1 Streetcar or train track:  collision with the track of a train or street car; often causing the bicycle wheel to slip or be lodged in the track’s depression (Question 5.1, response “Street car or train track”).1.1.4.2 Other surface:  Collisions with other unfavourable cycling surfaces, such as patches of rough road (including potholes), ice and gravel. (Question 5.1, responses “pothole” and “other” specification interpretations).271.1.5 Other (collision): collision with obstacles that do not fall into any other collision category, examples include a locked bicycle or a low tree branch, etc. (Question 5.1, response “Other” specification interpretations that did not fall into previous categories).1.2 Fall: crashes that were not initiated by the collision of the bicycle with another object (Question 5, response (0.) “No”. All variables were classified based on the interpretations of free responses to Question 4).1.2.1 Collision avoidance:  fall from attempting to avoid colliding with other object (person, car, obstacle) causing loss of control.1.2.1.1 Vehicle avoidance:  a fall resulting from an attempt to avoid colliding with a vehicle.1.2.1.2 Other avoidance:  a fall resulting from an attempt to avoid colliding with an object other than a vehicle, including pedestrians, othercyclists and curbs.1.2.2 Bicycle malfunction:  malfunction of a bicycle part, i.e. chain break, gear jam, brake failure.1.2.3 Wheel lodge: sudden halting of bicycle (wheel) caused by an item getting lodged in the wheel, examples include grocery bag, yoga mat, chain lock; often being carried on the handle bars.1.2.4 Cycling behaviour:  fall resulting from the action of the cyclist; often due to misjudgement or cyclist’s error.1.2.4.1 Clipped in: feet remained clipped into pedals when bicycle was at/close to a complete stop.1.2.4.2 Braking too hard:  exceeded required leverage on brake levers causing the bike to stop too quickly; forward momentum often propelling cyclist over handle bars.1.2.4.3 Cornering too fast:  failing to slow down enough for a turn causing bicycle tires to slip and bicycle to fall to side.1.2.4.4 Loss of balance:  loss of balance while riding, with no further explanation or cause given.1.2.5 No recollection:  an injury incident involving a cyclist falling off of bicycle in which the cyclist has no recollection of the circumstances of the fall, typically due to impact to head.281.2.6 Other (fall):  bicycle falls that do not fall into any other fall category, examples include crashes following a cyclists’ seizure, or due to the cyclists walking holding their dog’s leash.2. Motor-vehicle involvement: designates the presence of a motor vehicle in the relating to the event of the bicycle crash. 2.1 Motor-vehicle involved: crashes that include the presence of a specific motor vehicle in the description of the crash; includes not only direct collision with a motor vehicle, but also the avoidance of collision with a motor vehicle resulting in a collision with some other object or resulting the cyclist to fall. As well as the presence of a motor vehicle that required the cyclists to veer from its path. (Question 5.1, responses “Car, SUV, pick-up truck, van”, “Motorcycle or scooter”, “Large truck”, or “Bus or street car” as well as Question 4 interpretation). 2.2 No motor-vehicle involved: crashes that do not include the presence of a specific motor vehicle in the description of the crash. (All crashes not designated motor-vehicle related). Descriptive variables (3-7): Variable name:  definition (source in our dataset).3. Gender: gender of the cyclist (determined from response to Question 39)3.1 Male3.2 Female3.3 Not specified 4. Age Group:  age of the cyclist at time of interview (determined by subtracting year of birth, Question 34, from 2008, which designates the year of the interview)4.1 : 19 – 29 years of age4.2 : 30 – 39 years of age4.3 : 40 – 49 years of age4.4 : 50 – 59 years of age4.5 : 60 – 69 years of age294.6 70+ years of age4.7 Not specified 5. Foreign substance use: designates the consumption of any of the following foreign substances within 6 hours prior to the bicycling trip (Question 34, specifications below).5.1 Non-prescription substances: includes alcohol, marijuana and all drugs that are not over the counter or prescription (Question 34.2, 34.3, or 34.4; responses (1.) Yes)5.1.1 Alcohol:  examples include beer, wine or spirits (Question 34.2, response (1.) Yes)5.1.2 Marijuana:  including cannabis or hashish (Question 34.3, response (1.) Yes)5.1.3 Other recreational drugs:  examples include cocaine, heroin, and crystal meth (Question 34.4, response (1.) Yes)5.2 Medications:  over the counter or prescription medications (Question 34.1, response (1.) Yes)5.3 No substance use:  designates none of the above following substances were reported as consumed within 6 hours prior to the trip (Questions 34.1, 34.2, 34.3, and 34.4, responses of (0.) no, or (8.) don’t know). 6. Trip purpose: designates the primary intention of the bicycle trip (All direct responses from Question 23; hierarchy order used as below in order to choose single purpose from responses that included multiple.)6.1 Work commute:  going to or from work6.2 School commute:  going to or from school6.3 For employment: as part of job; e.g. as a courier6.4 Running errands: completing personal business; e.g. to or from store, appointment, etc. 6.5 Social reasons:  riding to or from social affairs; e.g. to the movies, visiting friends, etc. 6.6 Exercise: cycling for exercise or recreation306.7 Other:  riding a bicycling for a reason other than those described above; specifications include “trying a track bike” and “volunteering”7. City: designates the city in which the bicycle crash took place (determined by hospital attended, see specifications below).7.1 Toronto:  bicycle crashes that took place within the city of Toronto (Determined by designated hospital: (1) St. Michael’s and (2) University Health Network (TGH and Toronto Western)) 7.2 Vancouver: bicycle crashes that took place within the city of Vancouver (Determined by designated hospital: (3) St. Paul’s and (4) Vancouver General Hospital (VGH))Data AnalysisDescriptive VariablesThe injured cyclists’ genders and ages were tallied, in order to compare the variation in these independent variables between the two cities.  Frequencies of each category were compiled in Table 5, along with those of foreign substance use and trip purpose.  It was found that 52.3% of the cyclists’ interviewed from Toronto were male, while 58% of the Vancouver cyclists were male.  A chi-squared analysis resulted in a p-value equal to 0.326, which means that there is no significant difference in the gender of cyclists between Toronto and Vancouver.  The distribution of age of the injured cyclists was also compared between the two cities.  It was calculated that in Toronto the mean age was 38 years with a standard deviation of 12.8; in Vancouver, the mean age was 36 years with a standard deviation of 13.1.  The t-test was completed to determine if there was a significant difference in the age distributions, produced a p-value equal to 0.247, meaning there in no statistically significant difference in cyclists’ age between the two cities.  The similarity in the age distributions of cyclists in Toronto and Vancouver is visually represented in Figure 3, which also shows a negative relationship between age and the number of cyclists in each category. There were a total of 60 injured cyclists who gave positive responses to consuming foreign substances within 6 hours before the bicycle trip, with 42 consuming non-prescription foreign substances (32 alcohol, 9 marijuana, and 1 other recreational drug) and31Table 5:  Gender, age, foreign substance use, and trip purpose in Toronto and Vancouver.  This table shows the number (and percentage) of cyclists in Toronto and Vancouver in each category of the descriptive variables.  Descriptive variables Toronto Vancouver TotalGenderMale 78 (52.3%) 87 (58.0) 165 (55.2)Female 71 (47.7) 63 (42.0) 134 (44.8)Age19-29 62 (41.3) 52 (34.9) 114 (38.1)30-39 37 (24.7) 32 (21.5) 69 (23.1)40-49 25 (16.7) 34 (22.8) 59 (19.7)50-59 16 (10.7) 20 (13.4) 36 (12.0)60-69 8 (5.3) 8 (5.4) 16 (5.4)70+ 2 (1.3) 3 (2.0) 5 (1.7)Mean age, SD (95% CI) 36, 12.8 (34 - 38) 38, 13.1 (36 – 40) 37, 13.0 (36 - 38)Foreign Substance Use^alcohol 15 (9.8) 17 (10.1) 32 (10.1)marijuana 1 (0.7) 8 (5.0) 9 (2.9)other recreational drugs 1 (0.7) 0 (0.0) 1 (0.3)medications 12 (7.8) 16 (10.1) 28 (9.0)2 or more responses(total n=300) 3 (2.0) 8 (5.3) 11 (3.7)No substance use 124 (81.0) 118 (74.2) 242 (77.6)Trip Purpose*work commute 69 (46.0) 45 (30.0) 114 (38.0)school commute 5 (3.3) 3 (2.0) 8 (2.7)for employment 9 (6.0) 3 (2.0) 12 (4.0)running errands 29 (19.3) 20 (13.3) 49 (16.3)social reasons 22 (14.7) 35 (23.3) 57 (19.0)exercise 16 (10.7) 42 (28.0) 58 (19.3)other 1 (0.7) 1 (0.7) 2 (0.7)* p< 0.05; a statistically significant difference exists between cities^total n > 300, because cyclists could give multiple responses;  percentages: n(cities) = 150, n(total) = 30028 consuming medications including prescription and over the counter drugs.  Of the 60 positive responses to the consumption of a foreign substance, 11 cyclists had consumed two or more of the categories of foreign substances.  A comparison of foreign substance use between Toronto and Vancouver was completed; totals in each category can be found in Table 5.  Chi-squared analysis confirmed that the variation in the distributions of responses between the cities was not significant (p-value = 0.101).32Age DIstribution of Cyclists (Toronto vs. Vancouver)01020304050607019 - 29 30 - 39 40 - 49 50 - 59 60 - 69 70 + Age Category (years)Cyclists per category (of total 300)TorontoVancouverFigure 3: Bar graph of age distribution of cyclists in Toronto and Vancouver shows a relatively consistent pattern of age distribution in both cities. The t-test conducted yielded a p-value = 0.247, which indicates that there is no significant difference in the age distributions between the two cities.A comparison of the variable of trip purpose between the two cities showed a relatively different pattern amongst the categories, as portrayed in Figure 4.  It was found that more people in Vancouver were cycling for exercise (46 cyclists in Vancouver compared to 16 in Toronto) or social reasons (35 in Vancouver to 22 in Toronto) at the time of their crash than those is Toronto.  Cyclists in Toronto were cycling to work when they crashed more frequently than those in Vancouver (69 cyclists to 45, respectively).  The purpose of running errands was also more frequent in Toronto with 29 cyclists choosing this response compared to only 20 in Vancouver. Additionally, there were more people cycling for employment in Toronto than in Vancouver (9 and 3 cyclists, respectively) Chi-squared analysis showed a statistically significance difference between the trip purposes of cyclists in Toronto and Vancouver, with a p-value equal to 0.001.33Comparison of Trip Purpose in Toronto and Vancouver010203040506070work commute schoolcommuteforemploymentrunningerrandssocial reasons exercise otherTrip PurposeNumber of CyclistsTorontoVancouverFigure 4:  Variations in the purpose of bicycle trips in Toronto and Vancouver.  This graph shows large variation in the number of cyclists that were cycling for exercise at the time of their bicycle crash, with 42 cyclist in Vancouver and only 16 in Toronto.  It also shows that there were many cyclists in Toronto commuting to work at the time of their crash than in Vancouver with a difference of 24.  Application of chi-squared analysis to this data resulted in a p-value equal to 0.001, which implies that the difference in trip purpose responses between Toronto and Vancouver is statistically significant.  Primary Circumstance The primary circumstance behind each bicycle crash was established using the classification described earlier.  It was found that 72% (95% CI: 66.9 - 77.1%) of all bicycle crashes were the result of a collision with another object and that the other 28% (95% CI: 22.9 - 33.1%) were falls.  Figure 5 summarizes the breakdown of the primary circumstances within the bicycle crashes.  It shows that the circumstance with the highest number of crashes, 35% (95% CI: 29.3 - 40.1%), was due to collisions with motor-vehicles.   The second highest frequency, 23% (95% CI: 18.2 - 27.8%), was   collisions involving  the34Figure 5:  Percentage of cycling crashes within each category of Primary Circumstance.  The middle chart is colour coded so that shades of green designate collisions (72%) and shades of blue designate falls (28%). The smaller charts encircling show the percentages of crashes in each category of tertiary level of classification. 35cycling surface, 70% of which were with streetcar or train tracks making a total of 16% (95% CI: 11.9 - 20.2%) of all crashes related to streetcar or train tracks.  Interestingly, 7.3% (95% CI: 4.4 - 10.3%) of the crashes were falls due to collision avoidance, half of which avoidingwith automobiles. The results of the numbers of each primary circumstance are found in Table 6.Table 6:  Number of crashes in each category of Primary Circumstance in Toronto and Vancouver  This table shows the number and percentage of cyclist crashes in each of the categories within the outcome variable of Primary Circumstance, in the Toronto crashes, in the Vancouver crashes, and in all 300 crashes combined (Grand Total). Primary CircumstanceCity Grand TotalToronto Vancouver# % # % # %COLLISIONmotor vehicleautomobile 27 18.0 43 28.7 70 23.3over-sized vehicle 5 3.3 3 2.0 8 2.7vehicle door 20 13.3 6 4.0 26 8.7TOTAL 52 34.7 52 34.7 104 34.7person/animalcyclist 2 1.3 5 3.3 7 2.3pedestrian 1 0.7 6 4.0 7 2.3dog 1 0.7 2 1.3 3 1.0TOTAL 4 2.7 13 8.7 17 5.7cycling surfacestreetcar or train track 45 30.0 3 2.0 48 16.0other 15 10.0 6 4.0 21 7.0TOTAL 60 40.0 9 6.0 69 23.0infrastructure 6 4.0 16 10.7 22 7.3other (collision) 4 2.7 0 0.0 4 1.3TOTAL 126 84.0 90 60.0 216 72.0FALLcollision avoidancemotor vehicle 2 1.3 9 6.0 11 3.7other 3 2.0 8 5.3 11 3.7TOTAL 5 3.3 17 11.3 22 7.3bicycle malfunction 3 2.0 8 5.3 11 3.7wheel lodge 6 4.0 3 2.0 9 3.0cycling behaviourbraking too hard 2 1.3 9 6.0 11 3.7clipped in 0 0.0 4 2.7 4 1.3cornering 2 1.3 4 2.7 6 2.0loss of balance 4 2.7 9 6.0 13 4.3TOTAL 8 5.3 26 17.3 34 11.3no recollection 0 0.0 4 2.7 4 1.3other (fall) 2 1.3 2 1.3 4 1.3TOTAL 24 16.0 60 40.0 84 28.0Total Cyclists (Toronto/ Vancouver/Overall) 150 100.0 150 100.0 300 100.036In addition, Table 6 presents the variation in primary circumstance between cities.  A visual representation of this comparison was also created; Figure 6 shows circumstances that existed more prevalently in one city as opposed to the other.  For example, streetcar or train track incidents were very high in Toronto at 45 crashes, while there were only 3 crashes designated with a primary circumstance of streetcar or train tracks in Vancouver.  Figure 6 also shows that there was a large difference in collisions with vehicle doors (doorings) between the cities with 20 occurring in Toronto and only 6 in Vancouver.  0 5 10 15 20 25 30 35 40 45automobileover-sized vehiclevehicle doorcyclistpedestriandogstreetcar trackother infrastructureothermotor vehicleother bicycle malfunctionwheel lodgebraking too hardclipped incorneringloss of balanceno recollectionother (fall)motorvehicle.person/animal.cyclingsurface..collisionavoidance.cyclingbehaviour.COLLISIONFALLPrimary Circumstance: Toronto vs. VancouverToronto VancouverFigure 6: Primary Circumstance: Toronto vs. Vancouver. This graph compares the primary circumstances that resulted in 150 bicycle crashes in Toronto to that in Vancouver.  It shows there were more automobile collisions in Vancouver (43 crashes) than in Toronto (27) and that there were more vehicle doorings in Toronto (20) than in Vancouver (7).  The highest number of any circumstance resulting in crashes in one city comes from collisions with streetcar, or train, tracks in Toronto (45), while Vancouver only had 3 crashes primarily related to streetcar (or train) tracks.37Motor-vehicle InvolvementThe motor-vehicle involvement in each bicycle crash was also determined (as defined above) and the frequencies of motor-vehicle involvement within each category of primary circumstance are present in Table 7.  A total of 145 crashes, or 48% (95% CI: 42.4 – 54.0%) involved a specific motor-vehicle in the description of the crash.  It was also revealed that there are a high number of streetcar or train track incidents (21 crashes) that involved motor-vehicles; often the cyclist had to veer off their normal route around a stopped or parking car.  Figure 7 shows the motor-vehicle involvement overlain on the primary circumstance; this diagram illustrates the fact that the aside from the direct motor-vehicle collisions or collision avoidances, the involvement of motor-vehicles is scattered throughout the primary circumstances of bicycle crashes.  0 15 30 45 60 75automobileover-sized vehiclevehicle doorcyclistpedestriandogstreetcar trackother infrastructureother (collision)motor vehicleother bicycle malfunctionwheel lodgebraking too hardclipped incorneringloss of balanceno recollectionother (fall)motorvehicle.person/animal.cyclingsurface..collisionavoidance.cyclingbehaviour.COLLISIONFALLPrimary Circumstance: Motor-vehicle InvolvmentNo motor-vehicle involved Motor-vehicle involvedFigure 7: Primary Circumstance: Motor-vehicle Involvement. Graphical representation of the motor-vehicle involvement within each category of Primary Circumstance38Table 7:  Motor-vehicle involvement within each category of Primary Circumstance.  Shows the number of crashes that had/did not have motor-vehicle involvement, and the percentages of the total in all each category that those numbers represent. Cross-tabulationsIn order to compare the outcome variables between the two cities, odds ratios were calculated for Toronto versus Vancouver; these results are displayed in Table 8. The variable of primary circumstance was compared between cities, and it was determined that collisions Primary CircumstanceMotor-vehicle InvolvementMotor-vehicle involvedNo motor vehicle involvedCOLLISIONmotor vehicleautomobile 70(48.3%) 0 (0.0)over-sized vehicle 8   (5.5) 0 (0.0)vehicle door 26 (17.9) 0 (0.0)TOTAL 104 (71.7) 0 (0.0)person/animalcyclist 0 (0.0) 7 (4.5)pedestrian 0 (0.0) 7 (4.5)dog 0 (0.0) 3 (1.9)TOTAL 0 (0.0) 17 (11.0)cycling surfacestreetcar or train track 21 (14.5) 27 (17.4)other 1  (0.7) 20 (12.9)TOTAL 22 (15.2) 47 (30.3)infrastructure 3  (2.1) 19 (12.3)other (collision) 1  (0.7) 3  (1.9)TOTAL 130 (90.0) 86 (55.5)FALLcollision avoidancemotor vehicle 11 (7.6) 0 (0.0)other 1 (0.7) 10 (6.5)TOTAL 12 (8.3) 10 (6.5)bicycle malfunction 0 (0.0) 11 (7.1)wheel lodge 0 (0.0) 9 (5.8)cycling behaviourbraking too hard 1 (0.7) 10 (6.5)clipped in 1 (0.7) 3 (1.9)cornering 0 (0.0) 6 (3.9)loss of balance 0 (0.0) 13 (8.4)TOTAL 2 (1.4) 32 (20.6)no recollection 0 (0.0) 4 (2.6)other (fall) 1 (0.7) 3 (1.9)TOTAL 15 (10.3) 69 (44.5)Total cyclists (% of total) 145(48.3) 155 (51.7)39were significantly more common in Toronto through the calculation of an odds ratio (OR) of 3.68 (95% CI: 2.12 – 6.39).  In Toronto 84% (95% CI: 78.1 - 89.9%) of crashes werecollisions and in Vancouver only 60% (95% CI: 52.0 – 67.5%) were collisions, which indicates that falls were more common in Vancouver than Toronto. It was also determined that the odds were higher in Toronto for collisions with streetcar or train tracks (OR: 21; 95% CI: 6.36 – 69.4) and collisions with vehicle doors (OR 3.69; 95% CI: 1.44 – 9.48).  Furthermore, it was established that collisions with pedestrians or animals were less commonin Toronto than Vancouver (OR: 0.29; 95% CI:  0.09 – 0.91).  By comparing the other outcome variable, motor-vehicle involvement, in the two cities, it was determined that there was little difference in whether bicycle crashes involved motor-vehicles between cities (OR: 1.34; 95% CI: 0.85 – 2.11).Table 8:  Cross-tabulations of the outcome variables with city.  Outcome Variables City Total OR (tor/van)95% CIToronto Vancouver Lower UpperPrimary Circumstance - collision vs. fallCollision 126 (84%) 90 (60.0) 216 (72.0) 3.50* 2.03 6.04Fall 24 (16.0) 60 (40.0) 84 (28.0) referencePrimary Circumstance- streetcar or train tracksStreetcar or train tracks 45 (30.0) 3   (2.0) 48 (16.0) 21.0* 6.36 69.39Other 105 (70.0) 147 (98.0) 252 (84.0) referencePrimary Circumstance – vehicle door (doorings)  Vehicle door 20 (13.3) 6   (4.0) 26   (8.7) 3.69* 1.44 9.48Other 130 (86.7) 144 (96.0) 274 (91.3) referencePrimary Circumstance - person/animal  Person/animal 4   (2.7) 13   (8.7) 17   (5.7) 0.29* 0.092 0.907Other 146 (97.3) 137 (91.3) 283 (94.3) referenceMotor-vehicle InvolvementMotor-vehicle involved 78 (52.0) 67 (44.7) 145 (48.3) 1.34 0.852 2.113No motor-vehicle involved 72 (48.0) 83 (55.3) 155 (51.7) reference*designates statistically significant odds ratiosMore cross-tabulations were conducted to determine if there was a significant difference in the frequency of collisions or motor-vehicle involvement depending on the simplified categories of the descriptive variables; these odds ratios can be found in Table 9 and Table 10 for collisions and motor-vehicle involvement, respectively. 40Table 9:  Cross-tabulations of simplified-category descriptive variables with Primary Circumstance.Descriptive VariablesPrimary Circumstance Total OR (collision/fall)95% CILower UpperCollision FallGendermale 111 54 165 0.593* 0.352 0.998female 104 30 134 referenceAgeyoung (<30) 126 59 185 0.600 0.349 1.03older 89 25 114 referenceForeign substance usenon-prescription substances 26 16 42 0.58 0.294 1.16medications 21 7 28 1.08 0.438 2.66no substance use 178 64 242 referenceTrip Purposework/school 117 17 134 4.66* 2.57 8.45other 99 67 166 referenceCityToronto 126 24 150 3.50* 2.03 6.04Vancouver 90 60 150 reference* designates statistically significant, non-adjusted odds ratiosIt was found that male cyclists were less frequently in crashes due to collisions than female cyclists (OR: 0.593; 95% CI:  0.352 – 0.998).  It was also determined that collisions were more common than falls while commuting to or from work or school than riding for other purposes (OR: 4.66; 95% CI: 2.57 – 8.45), and they are also more common in Toronto than Vancouver (OR: 3.50; 95% CI: 2.03 – 6.04).  There was no significant difference in collisions versus falls when comparing crashes of young and older cyclists or when cyclists consumed various foreign substances within 6 hours prior to their trip (see Table 9).  By cross-tabulating motor-vehicle involvement with the simplified descriptive variables, it was found that young cyclists, less than 30 years old, were more frequentlyinvolved in a bicycle crash involving a motor vehicle than older cyclists (OR: 2.00; 95% CI: 1.25 – 3.21).  Additionally, crashes involved motor-vehicles more frequently on trips where the cyclists was commuting to or from work or school than trips that were made for other purposes (OR: 2.89; 95% CI: 1.81 – 4.63).  No other simplified descriptive variable had a category that was significantly more common in a bicycle crash with motor vehicle-involvement (see Table 10). 41Table 10: Cross-tabulations of simplified-category descriptive variables with Motor-vehicle Involvement.  Descriptive Variables Motor-vehicle Involvement Total OR motor/no95% CIyes no Lower UpperGendermale 77 88 165 0.875 0.554 1.38female 67 67 134 reference Ageyoung (<30) 67 47 114 2.00* 1.25 3.21older 77 108 185 referenceForeign substance usenon-prescription substances 15 27 42 0.556 0.282 1.10medications 14 14 28 1.00 0.45 2.19no substance use 121 121 242 referenceTrip Purposework/school 84 50 134 2.89* 1.81 4.63other 61 105 166 referenceCityToronto 78 72 150 1.34 0.852 2.11Vancouver 67 83 150 reference* designates statistically significant non-adjusted odds ratiosLogistic Regression Two multiple logistic regression models with binary outcome variables were completed to determine the relationship of multiple factors on the odds ratios associated with 1) collisions versus falls and 2) motor-vehicle involvement versus not.  The descriptive variables that had significant odds ratios in Table 9 were used as the covariates in the logistic regression of the primary circumstance: collisions versus falls.  The results of this firstlogistic regression model, found in Table 11, show the combined relationship of gender, trip purpose and city, with collisions versus falls.  Collisions remained significantly more frequent that falls on bicycle trips to or from work or school than on trips with other purposes (adjusted OR: 4.42; 95% CI:  2.38 – 8.23).  Collisions also remained significantly more frequent than falls in Toronto than in Vancouver (adjusted OR: 2.86; 95% CI: 1.62 – 5.07).  Based on the results of the logistic regression, the adjusted odds ratio of the relationship of gender to collisions versus falls was found to no longer be statistically significant, which means that when the influence of city and trip purpose were included, the number of collisions was no longer significantly more common for females than males.  42Table 11:  Logistic Regression Results for Primary Circumstance—Collision.  Descriptive Variables BStandard Error p-valueOR(= eB)95% CILower UpperGendermale (1) -0.340 0.284 0.232 0.712 0.408 1.24female (0) referenceTrip Purposework/school (1) 1.487 0.317 0.000 4.42* 2.38 8.23other (0) referenceCityToronto (1) 1.052 0.291 0.000 2.86* 1.62 5.07Vancouver (0) referenceconstant 0.158 0.256 0.538 1.17 0.709 1.93*designates statistically significant, adjusted odds ratios, based on sig.<0.05. In congruence with the procedure above, the descriptive variables that had significant odds ratios in Table 10 were used as the covariates in the logistic regression of motor-vehicle involvement.  The covariates in this case were the descriptive variables of age and trip purpose.  The results of this binary logistic regression can be found in Table 12.  It was found to be more common for crashes of young cyclists (<30 years old) to have motor-vehicle involvement than crashes of older cyclists, based on the adjusted odds ratio calculated to be 2.02 (95% CI: 1.24 – 3.30).  The results of the logistic regression model also showed that crashes that occurred while commuting to or from work or school more commonly involved a motor-vehicle than crashes on trips made for other purposes (adjusted OR: 2.88; 95% CI 1.79 – 4.65).  Both of these descriptive variables were found to still have statistically significant odds ratios after their combined association with motor-vehicle involvement was assessed.  Table 12:  Logistic Regression Results for Motor-vehicle Involvement.  Descriptive Variables BStandard Error p-valueOR(=eB)95% CILower UpperAgeyoung (1) 0.705 0.250 0.005 2.02* 1.24 3.30older (0) referenceTrip Purposework/school (1) 1.058 0.244 0.000 2.88* 1.79 4.65other (0) referenceconstant -0.816 0.192 0.000 0.442* 0.304 0.644*designates statistically significant, adjusted odds ratios, based on sig.<0.05. 43DISCUSSION & CONCLUSIONSJustification of the Bicycle Crash Classification Scheme The Bicycle Crash Classification was developed on the basis of a review of multiple other systems, allowing our scheme’s content and structure to be as comparable as possible to other systems.  Our analysis incorporates a wide variety of variables including both descriptive and outcome variables, which is a step up from some of the systems reviewed including the “Ten classes of Bicycle-automobile accidents in Davis, CA” (Lott & Lott, 1976), and the “Factors in the Initiation of Bicycle-vehicle Collisions” (Williams, 1976), which only address the movement of the bicycle and automobile and no other variables in the bicycle crash.  Other systems go into a more detailed categorization of a specific injury, for example the Occupational Injury and Illness Classification Manual (OIICM) (U.S. Dept. of Labor, 1992) classifies the injury or illness and detailed classification of causes, including secondary source of injury.  Such a detailed classification was not used in this study, because we focused on pre-event and event circumstances rather than the injury itself. The International Classification of External Causes of Injury (ICECI) (ICECI Coordination and Maintenance Group, 2004) was found to be very influential in the development of our classification system because in its “Core Module” it incorporated more descriptive variables along with the main cause, including substance use and location.  The “Sport Module” was also useful, because it presented some unique variables, including the phase of activity, and many categories within each variable that could be applicable to our classification.  Additionally, the systematic structure presented in the ICECI made it obvious that this adds to the efficient application of this system and inspired the structure of the classification presented here. Discussion of the AnalysisIn this study, 300 bicycle crashes were classified by two main dependent variables: the primary circumstance of the crash; and motor-vehicle involvement within the crashand/or pre-crash events.  Although these two variables seem to directly overlap in some categories of the primary circumstance, e.g. collisions with motor-vehicles, there were quite a few categories of primary circumstance that had less obvious motor-vehicle involvement44(refer to Figure 7).  For example, there is motor-vehicle involvement in 48.3% (95% CI:  30.7 – 57.7%) of the collisions with streetcar or train tracks.  With the overall involvement of motor-vehicles in the bicycle crashes equal to 48.3% (95% CI:  42.7 – 54.0%), it seems that a great reduction in the number of crashes could be possible if cycling infrastructure did not overlap that of motor vehicles.  Many other studies bring support to this argument; one on fatal bicycle crashes, found that 91% of fatal crashes are due to motor-vehicle collisions (Rowe et al., 1995).  The separation of cyclists from motor vehicles should not only decrease collisions with motor vehicles, but will also decrease the rates of injury crashes that simply involve the presence motor vehicles. A further look at the categories of primary circumstance shows variation in the proportions of crashes associated with each category, where high crash proportions suggest areas that should be addressed in order to increase bicycling safety.  The 72% of crashes classified as collisions, seem more simply preventable by alteration of the cycling environment than falls (the other 28%), due to the fact that collisions are defined by contact with another object in the cycling environment.  The second-highest proportion of injury crashes (23%) occurred as a result of collisions with the cycling surface, which includedstreetcar or train tracks, potholes, ice, and uneven pavement.  The simple repair of roadways or creation of bicycle lanes on streets without streetcar tracks could decrease the rates of these types of crashes.  Falls, on the other hand, may be harder to assess by altering the environment, since many of these were associated with factors that the cyclists must alter themselves, including cycling behaviours such as mot carry things on the handle bars, which led to most of the wheel lodges and keeping up with their bicycle maintenance.  The variation in crashes between Toronto and Vancouver suggests that some aspects or areas are more important to assess in one city than the other.  The fact that there was a much higher odds of a crash involving a streetcar or train track in Toronto, is almost certainly due to the fact that Toronto has over 68 kilometres of streetcar tracks (Toronto Transit Commission, 2008) running through its downtown sector; however, this clearly presents an area that needs to be assessed in Toronto to make cycling more safe.  By further inquiry into the descriptions behind the pedestrian/animal collisions, which were more common in Vancouver, it becomes clear that there is a pattern of these crashes occurring on the Stanley Park Seawall.  The Seawall is characterized by a 22 kilometre path with divided lanes for 45cyclists or pedestrians (Vancouver Park Board, 2010), and it has no comparable equivalent in Toronto.  This is an area in Vancouver where a more distinct separation of the bike lane from the pedestrian lane may decrease the number of pedestrian or animal collisions.  The information contained in the categories of primary circumstance may be useful to municipalities attempting to improve the safety of cycling in their city.Strengths and LimitationsIt was difficult to decide how to categorize the primary circumstance of each crash, especially within the fall category.  This may contribute to an over application of the “other”categories in future use of this classification scheme.  The classification of another set of bicycle crash data, after these original 300 that were used to create the scheme, would help determine whether the scheme is broadly applicable.The use of bicycle crashes in two cities makes the results of this study stronger and also contributes to the relevance of the scheme directly; without the inclusion of crashes from Toronto, the danger associated with streetcar or train tracks as an object of collision would not have been as obvious. ConclusionsAn investigation into cycling injury crashes found that motor vehicles are involved in more crashes than just bicycle-vehicle collisions and that streetcar tracks represent a high proportion of the primary circumstance of crashes.  Trip purpose was also determined to have a significant relationship with the outcome characteristics of a bicycle crash; while the use of drugs or alcohol was not significantly related to the crash circumstances. Although cycling injuries continue to deter people from cycling, the variation in crash frequencies associated with different circumstances suggests that alteration of cycling infrastructure could decrease the rates of associated injuries.  46REFERENCES CITEDBoogaard, H.; Borgman, F.; Kamminga, J. and G. Hoek, 2009. Exposure to ultrafine and fine particles and noise during cycling and driving in 11 Dutch cities. AtmosphericEnvironment, vol. 43, pg. 4234-4242.Cavill, N. and A. Davis, 2007. Cycling and health: What's the evidence? Cycling England, UK Department of Transportation (Report).Cushman, R.; Down, J.; MacMillan, N. and H. Waclawik, 1990.  Bicycle-related Injuries: a survey in a paediatric emergency department.  Canadian Medical Association, vol. 143 (2), pg. 108-112.Finch, C.; Valuri, G. and J. Ozanne-Smith, 1998.  Sport and active recreation injuries in Australia: evidence from emergency department presentations.  British Journal of Sports Medicine, vol. 32, pg. 220 – 225. Gordon-Larsen, P.; Boone-Heinonen, J.; Sidney, S.; Sternfeld, B., Jacobs, D.R.Jr. and C.E. Lewis, 2009. Active commuting and cardiovascular disease risk. Archives of Internal Medicine, vol.169, pg.1216-1223.Gordon-Larsen, P.; Nelson, M.C. and K. Beam, 2005. Associations among active transportation, physical activity, and weight status in young adults. Obesity Research,vol.13, pg. 868-875.Hamer, M. and Y. Chida, 2008. Active commuting and cardiovascular risk: a meta-analytic review. Preventative Medicine, vol. 46, pg. 9-13.ICECI Coordination and Maintenance Group, 2004. International Classification of External Causes of Injuries (ICECI) version 1.2. Consumer Safety Institute, Amsterdam and AIHW National Injury Surveillance Unit, Adelaide.Katzmarzyk, P.T. and I. Janssen, 2004. The economic costs associated with physical inactivity and obesity in Canada: an update. Canadian Journal of Applied Physiology, vol. 29, pg. 90-115.Lindström, M.  2008. Means of transportation to work and overweight and obesity: a population-based study in southern Sweden. Preventative Medicine, vol. 46, pg 22-28.47Lott, D.F. and D.Y. Lott, 1976, Effect of Bike Lanes on Ten Classes of Bicycle-Automobile Accidents in Davis, California, Journal of Safety Research Vol. 8 (4), pg 171 – 179.Maimaris, C.; Summer, C.L; Browning, C.; and C.R. Palmer, 1994.  Injury patterns in cyclists attending an accident and emergency department: a comparison of helmet wearers and non-wearers. BMJ vol. 308, pg 1537-1540. Meuleners, L.B.; Gavin, A.L.; Cercarelli, L.R.; and D. Hendrie, 2003.  Bicycle Crashes and Injuries in Western Australia, 1987-2000.  Injury Research Centre, The University of Western Australia.Microsoft, 2003. Microsoft Office Excel (Excel), Microsoft, Redmond, WA.Pucher, J. and R. Buehler. 2005.  Cycling trends and policies in Canadian cities. World Transport Policy and Practice, vol. 11 (1), pg 43-61.Pucher, J and L, Dijkstra. 2003. Promoting safe walking and cycling to improve public health: lessons from the Netherlands and Germany. American Journal of Public Health, vol. 39 (9), pg.1509-1516.  Reynolds, C.O.C.; Harris, M.A.; Teschke, K.; Cripton, P.A. and M. Winters, 2009.  “The impact of transportation infrastructure on bicycling injuries and crashes: a review of the literature.” UBC. Publication in process. Robinson, D.L. 2004.  Reasons for trends in cyclist injury data.  Injury Prevention. Vol. 10, pg 126 –127. SPSS Inc. 2008. Statistical Package for the Social Science (SPSS) Version 17.0, IBM Company Headquarters, Chicago, IL.Tan, C. 1995. “Crash-Type Manual.” University of North Carolina Highway Safety Research Center. U.S. Department of Transport Pub No. FHWA-RD-96-104. http://www.tfhrc.gov/safety/pedbike/ctanbike/ctanbike.htm (23 October 2009) . Transport Canada. 2005.  Canadian Motor Vehicle Traffic Collision Statistics: 2004,Ministry of Transport, Catalogue T45-3/2004.Toronto Transit Commission. 2008.  “Life-Line Script”,http://www3.ttc.ca/About_the_TTC/Projects_and_initiatives/Lifeline_script.jsp (23March 2010). U.S. Department of Labor, Bureau of Labor Statistics, 1992.  Occupational Injury and Illness Classification Manual (OIICM). 48Vancouver Park Board. 2010. “The Seawall” http://vancouver.ca/PARKS/parks/Stanley/seawall.htm (23 March 2010) Wen L.M. and C. Rissel, 2008.  Inverse associations between cycling to work, public transport, and overweight and obesity: findings from a population based study in Australia. Preventative Medicine, vol. 46, pg. 29-32.Williams, A.F. 1976. “Factors in the Initiation of Bicycle-Motor Vehicle Collisions.”  American Journal of Diseases of Children, vol. 130, pg 370 – 377.Winters, M.; Teschke, K.; Grant, M.; Setton, E.M. and M. Brauer.  2010.  How far out of the way will we travel? Built environment influences on route selection for bicycle and car travel.  To be published in Transportation Research Record: Journal of the Transportation Research Board March 2010. 49Sequential Number:INTERVIEW FORMHospital: 1. St. Michael’s2. TGH3. St. Paul’s4. VGHDate Attended ED: ____ / ____ / ________DD MM YYYYCame by ambulance: 0. No1. YesAdmitted to Hospital: 0. No1. YesCTAS:Thanks so much, [name of participant], for agreeing to take part in this study. The interview should take about45 minutes.I’ll ask you about the route you cycled when you were injured, including the injury site, and two other sites,randomly selected along the route.Did you receive a copy of the consent form with our letter of introduction to the study?[If no , give a copy.][If ye s :] Do you have it with you?[If no , give a copy.]Do you have any questions about it?If you haven’t already done so, could you please read it and sign 2 of them? I’ll keep one, and you keepone.[Proceed when the consent form has been signed.]Are there any questions you'd like me to answer before we begin the interview?[Give time to answer.]Feel free to stop me and ask questions at any time during the interview. If there is a question that you feeluncomfortable answering, you are welcome to let me know that you don’t want to answer it.Interviewer:Date of interview: ____ / ____ / ________DD MM YYYYInterview Form: 6/1/08Interview Start: ____:_____ am pmhr: minAPPENDIX A50INJURY DESCRIPTIONI will start by asking you about the trip when you sustained your injuries.1. When did you take this trip? [Provide calendar] Date: __________  __   / ____ / ____ / ________ Day ofWeek DD MM YYYY1.1 What time did you leave your starting point? [Best estimate] _____ :__   am pm hr: min1.2 At what time did the trip end? [Best estimate] _____:_  _ am pm[Stopped cycling] hr: min2. What day did you visit the Emergency Department? Same day[If different day:] Date: ____ / ____ / ______ DDMM YYYY3. Were you admitted to hospital, in other words, did you stayovernight in a ward other than the Emergency Department? 0. No1. Yes4. In your own words, please describe the circumstances of the injury incident: [Record as verbatim as possible.]How are you feeling?4.1 Are you willing to have this description reported to the city,without your name or identifying features, such as the street names? 0. No1. YesInterview Form: 6/1/08515. Was this a collision between you and a motor vehicle, person, animal orobject (including holes in the road)?0. No1. Yes[If ye s ] 5.1 What did you collide with?[Check all that apply]Car, SUV, pick-up truck, vanMotorcycle or scooterLarge truckBus or streetcar Pedestrian CyclistOther non-motorized wheeled transportPot hole or other holeStreet car or train trackAnimal [describe]:Other [describe]:Interview Form: 6/1/0852BROUTE AND SITE IDENTIFICATION6. Now I am going to ask you questions about the complete route you took on your cycling injury trip. I will ask aboutthe starting point of the trip, the site of the injury incident, and the trip end point.6.1 Where was your trip starting point?[“A”, nearest intersection, description, don’t indicate “home”]6.2 Where did the injury incident occur?[point of impact, not where thrown to] [“B”, nearest intersection, description, don’t indicate “home”]6.2.1 Was the injury incident at an intersection?[Intersection is meeting point of 2 roads]6.3 Where was your trip end point? If the end point ofthe trip changed because of the injury incident, Iwould like to know the actual end point, not yourplanned destination.1. Non-intersection2. IntersectionActual trip end point same as B[If different, “C”, nearest intersection, description, don’t indicate “home”]7. Would you feel comfortable tracing your complete route on a map?Use map to trace the route, using pencil initially. Check if correct, then mark with pen.Mark these points in pencil - “A” trip start with a perpendicular stroke & - “B” injury sitethe letter at the end of the stroke - “C” actual trip endThen measure route length with digital map wheel.Could I also ask you to mark your original planneddestination and the route you would have taken tothat destination?Planned destination same as C[If different, “F”, brief description, don’t indicate “home”]Mark intended destination - “F” intended destinationInterview Form: 6/1/0853DExcuse me for a few minutes, while I select two other sites on the route.8. Total trip distance from starting point “A” to end point “C”: ________________km, to 2 decimal places9. Calculate distance from trip starting point “A” to additional site “D”,then measure and mark on map.Proportion______   _ X total trip distance from 8. above = ________________km, to 2 decimal places9. 1 Indicate if intersection or not. If on edge or in doubt, markas non-intersection.10. Calculate distance from trip starting point “A” to additional matched site “E”, then measure and mark on map.1. Non-intersection2. IntersectionProportion_________ X total trip distance from 8. above = ________________km, to 2 decimal places10. 1  Measure distance. This site is matched to “B” as an intersection or not.If map wheel arrives at correct type of location, mark as “E”on map.If not, check Sequential Number. If even, go forward alongthe route to nearest correct location, if odd, go back to nearest correct location.Match to B :E 1. Non-intersection2. IntersectionInterview Form: 6/1/0854OName:ODate:OTime:SITE-SPECIFIC QUESTIONS: INJURY SITE BNow I’d like to ask you some questions about the site where you were injured – site B on the map. [Indicate]First, I’d like to check where you were cycling. At this point, you were [choose based on info from page 4 or 5]11.1 1. At a non-intersection location.Were you [read 3 categories]2. At an intersection.Immediately before you entered the intersection,were you [read 2 categories]11.2 1. Away from roads 2. On a sidewalk or path next to a road 3. On a road11.3 Were you on the1. right side of path2. middle of path3. left side of path4. no pathWas the sidewalk / path1. to the right of the road2. in centre of road (e.g., boulevard)3. to the left of the roadWere you on the1. right side of road2. middle of road3. left side of road4. back lane/alley11.4 Where were you within the sidewalk /path?1. right side2. middle3. left side8. DKSo you were on the [indicate answer above].Now, within that side of the road, wereyou in a marked [read categories]:1. right lane2. middle lane3. left lane4. parking lane5. bike lane6. shoulder7. or were there no marked lanes?8. DK11.5 Was this path / sidewalk [read categories]:1. for cyclists only2. for pedestrians only [if DK, default for sidewalk]3. for pedestrians, cyclists, and other users[if DK, default for off-road path]11.6 In which direction were you travelling compared tomotor vehicle traffic?1. in the same direction as motor vehicle traffic2. facing motor vehicle traffic on your side of thestreet12.   Now we need a sketch of the site [in pencil]. Would you feel comfortable drawing it for me?Please mark the following: - Names of streets or other identifiable features- Your location (with an X)- Direction of travel (with an arrow, before & after the X)[Check map.]N55B13. What type of surface were you cycling on at this point? Would you say it was [read categories]:[Check all that apply]Smooth pavementPavement with potholes, bumps, trainor streetcar tracksCobblestones, bricks, or paving stonesPacked gravel or dirtLoose gravel or dirtGrassOther [specify: _______  __  __  __   __   ]DKB14. Was the surface dry, wet, icy, or snowy?[Check all that apply]Dry[If wet, prompt about puddles] WetPuddles of watersIcySnow coveredB15. Did the surface have debris such as leaves, glass, sand, gravel, or papers, on it?0. No1. Yes8. DK[If ye s ] B15.1 Was it [read categories]:[Check all that apply] Leaves Glass[If needed, prompt that there was Sand “enough debris that you found it Gravel bothersome”.] PapersOther [specify: _______  __  __  __  __  ]B16. Please estimate how fast you were going at this point:1. less than 15 km/h2. 15 to 29 km/h3. 30 km/h or more8. DKB17. Was it dawn, daytime, dusk, or night-time at this point on the trip?:1. Dawn (not fully light)2. Day3. Dusk (beginning to get dark)4. NightB18. Were there any street lights that were on and illuminating this site?0. No1. Yes8. DK56B19. Were you travelling with one or more companions at this point?0. No1. Yes[If ye s ] B19.1 How many others were with you, and how were they travelling?[Check all that apply]On same bike as me # _____ Cycling,on different bike # _____ Jogging/ walking # _____ In-lineskating / skateboarding # _____ Stroller# _____ Other[specify: _______  __  __  ] # _____B20. How safe do you think this site was for cyclists on that trip? Would you say it was [read categories:]1. Very dangerous2. Somewhat dangerous3. Neither safe nor dangerous4. Somewhat safe5. Very safe8. DK, no opinion[If ve ry dan ge rous or somewhat dange ro u s]B20.1 What dangers do you think there are at this site? [Record in point form.]B21. Was there construction work or any other temporary features at this site?0. No1. Yes8. DK[If ye s ] B21.1 Please describe them: [Record in point form.]B22. Do you have any other comments about this site you would like to add? [Record in point form.]57OTHER CHARACTERISTICS OF THE TRIPNow, I would like to ask you some questions about your bike, your visibility, and some personal circumstanceson this trip. These questions are not the main focus of the study. Your answers will be used for descriptivepurposes only.23. What was the purpose of this trip?[Read list & check all that apply]To go to or from workTo go to or from schoolAs part of your job (e.g., courier)For personal business, e.g., shopping, doctor’s visitFor social reasons, e.g., visiting friends, moviesFor exercise or recreationOther [specify: ______________   _________   ____]24. What was the weather like on this trip?[Check all that apply]Clear skyPartial cloud coverComplete cloud cover[Probe about cloud cover, Fog/Mistprecipitation & wind.] Smog/SmokeRaining [include light and heavy rainfall]SnowingHailStrong winds against youStrong winds with youStrong crosswind25. What type of bike were you riding?1. City bike[Show photos] 2. Touring/road bike3. Mountain bike4. Racing bike5. Folding bike6. Recumbent7. Hybrid8. Cruiser9. Other [specify: _______________   __________   _   ]26. When was the last time this bike underwent maintenance prior to the injury incident?1. less than 1 month before2. 1 to 6 months before3. 7 to 11 months before4. 1 year to 3 years before5. more than 3 years before6. never8. DK9. Refuse5827. During this trip, prior to the injury incident, did you 0. Nonotice anything that needed to be fixed on this bike? 1. Yes [specify: ]8. DK9. Refuse28. How old is this bike? ____  ___ years8. DK9. Refuse29. Did you have a front light that was turned on during this trip? 0. No1. Yes8. DK9. Refuse30. Did you have a back light that was turned on during this trip? 0. No1. Yes8. DK9. Refuse31. What colour was the clothing on your upper body? [specify: ]7. No clothing on upper body8. DK9. Refuse32. What colour was the helmet you were wearing? [specify: ]7. No helmet8. DK9. Refuse33. In the 24 hours prior to this trip, how many hours of sleep hours had you had? 8. DK9. Refuse34. In the 6 hours prior to this trip, had you consumed any ofthe following:34.1 Over the counter or prescription medications 0. No1. Yes8. DK9. Refuse34.2 Alcohol, such as beer, wine, spirits, cider 0. No1. Yes8. DK9. Refuse34.3 Marijuana, cannabis or hashish 0. No1. Yes8. DK9. Refuse34.4 Other recreational drugs 0. No[If examples needed: cocaine, heroin, crystal meth] 1. Yes8. DK9. Refuse59CYCLING AND DRIVING EXPERIENCENow I have some questions about your cycling and driving experience. As with the last section, thesequestions are not the main focus of the study. Your answers will be used for descriptive purposes only.35. Please tell me how frequently you cycled in the 12 months prior to this injury event:35.1 in the winter (Dec, Jan, Feb) 0. never1. less than once a month, but more than never2. 1 to 3 times a month3. 1 to 3 times a week4. 4 or more times a week8. DK35.2 in the spring (Mar, Apr, May) 0. never1. less than once a month, but more than never2. 1 to 3 times a month3. 1 to 3 times a week4. 4 or more times a week8. DK35.3 in the summer (Jun, Jul, Aug) 0. never1. less than once a month, but more than never2. 1 to 3 times a month3. 1 to 3 times a week4. 4 or more times a week8. DK35.4 in the fall (Sept, Oct, Nov) 0. never1. less than once a month, but more than never2. 1 to 3 times a month3. 1 to 3 times a week4. 4 or more times a week8. DK36. Have you ever taken an urban cycling training course?0. No1. Yes37. Would you consider yourself an experienced cyclist?0. No1. Yes2. Somewhat38. Have you ever had a driver’s license? 0. No1. Yes[If ye s ] 38.1.  At what age did you firstlearn to drive? ____  __ years old88. DK60DEMOGRAPHIC INFORMATIONI would like to finish by asking you a few questions that will allow us to compare the general characteristics of thepeople who participated in this study to other adults in the Metro area.39.  [Record gender] 1. Male2. Female40. What is the total number of people who live your household (including yourself)?____   __88. DK99. Refuse[If 1 or mo re] 40.1 How many people who live in your household are < 19 years of age?____   __88. DK99. Refuse41. What was your employment status at the time of the injury incident?1. Working for pay full-time (≥ 30 hours/week)2. Working for pay part-time (< 30 hours/week)3. Seasonal work4. Homemaker5. Student6. Retired7. Unemployed8. Disabled, unable to work88. DK99. Refuse42. What is your highest level of education?1. < high school[Do not provide categories, 2. Completed high schooluse open-ended answer as basis 3. Some post-secondary educationfor categorizing] 4. Completed college or technical diploma5. Completed university degree6. Completed graduate university degree8. DK9. Refuse43. What was your year of birth? ____  __YYYY99. Refuse

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