Section Information: Abstracts of Poster and Platform Presentations for the 2004 Combined Sections Meeting: Platform Presentations
T.A. Kolobe, Physical Therapy, University of Oklahoma Health Science Center, Oklahoma City, OK, M. Bulanda, C. Horodyski, Physical Therapy, University of Illinois at Chicago, Chicago, IL, L. Pasillas, El Valor Coporation, Chicago, IL.
PURPOSE/HYPOTHESIS: This study compared the accuracy with which the Peabody Developmental Motor Scale, 2nd edition (PDMS II) and Bayley Scales of Infant Development, 2nd edition (BSID II), diagnosed motor delay and disabilities at preschool age.
NUMBER OF SUBJECTS: Fifty children who were part of a longitudinal study participated in this follow-up study. A third of the children had been identified as developmentally delayed at 1 year of age.
MATERIALS/METHODS: The PDMS II and BSID II were administered to the children at 3 years of age.
ANALYSIS: The Pearson product moment correlation coefficient was used to examine the relationship between the mental and psychomotor indices of the BSID II (MDI &PDI), and the PDMS II fine and motor developmental quotients (FMQ &GMQ). Diagnostic values were computed to compare the accuracy of tests in classifying the children.
RESULTS: Correlation coefficients between the BSID II and PDMS II developmental quotients were all statistically significant. Coefficients ranged from 0.67 – 0.84 (P = 0.001). Analyses of the sensitivity, specificity, and predictive values using −2 standard deviations (sd) below the mean and the child’s medical diagnosis revealed that the BSID II and PDMS II correctly identified 80% and 100% of children with developmental disabilities, respectively. The cutoff of −1sd on the BSID II correctly classified 42%-46% of the children with motor delay.
CONCLUSIONS: Although the correlation between the two tests was high, the tests differed in their accuracy in identifying children with motor delay. The MDI and PDI misclassified more children compared to the FMQ and GMQ. The findings also suggest that the cutoff of −1sd may not be a reliable indicator of motor delay in children at preschool age. CLINICAL RELEVANCE: Physical therapists dedicate a considerable proportion of clinical time diagnosing children with motor delays or disabilities. Although the BSID II and PDMS II are widely used for this purpose, their accuracy in diagnosing motor performance has not been examined. These findings suggest that the two tests vary in how they diagnose motor performance.