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Use of the revised Bayley scales of infant development with high-risk infants: exploration of changes in scores and relationships between risk variables and performance

University of British Columbia

Cognitive and mental performance of 53 high-risk infants (34 prenatally exposed to drugs, and 19 born prematurely and/or with significant perinatal medical concerns) was measured using the Revised Bayley Scales of Infant Development (BSID-II) at less than 12 months, and at around 18 months of age. A retrospective chart review was used to collect BSID-II data and information on biological and environmental risk variables. The high-risk infants scored lower on the Mental and Motor Scales at both testing times compared to the norms (p<.01). Cognitive performance decreased over time if extrapolated scores were used in the analysis (p<.01). Infants born prematurely and/or with significant perinatal medical concerns had better overall motor performance compared to infants prenatally exposed to drugs (p<.01). Their motor scores increased, while the scores obtained by infants prenatally exposed to drugs decreased, regardless of whether or not extrapolated scores were used (p<.01). There were a few, isolated instances of linear relationships between risk variables, and cognitive and motor scores. The variance explained by regression equations tended to be low. Use of performance classifications versus extrapolated scores was the preferred method to include very low scores in analyses. Cumulative measures of environmental and biological risks could be better predictors of developmental outcomes than use of single variables.

Thesis/Dissertation

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2009-07-13

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http://hdl.handle.net/2429/10670

Rehabilitation Sciences

University of British Columbia

UBCV

DSpace