%0 Journal Article %J Archives of Physical Medicine and Rehabilitation %D 2006 %T Measurement precision and efficiency of multidimensional computer adaptive testing of physical functioning using the pediatric evaluation of disability inventory %A Haley, S. M. %A Ni, P. %A Ludlow, L. H. %A Fragala-Pinkham, M. A. %K *Disability Evaluation %K *Pediatrics %K Adolescent %K Child %K Child, Preschool %K Computers %K Disabled Persons/*classification/rehabilitation %K Efficiency %K Humans %K Infant %K Outcome Assessment (Health Care) %K Psychometrics %K Self Care %X OBJECTIVE: To compare the measurement efficiency and precision of a multidimensional computer adaptive testing (M-CAT) application to a unidimensional CAT (U-CAT) comparison using item bank data from 2 of the functional skills scales of the Pediatric Evaluation of Disability Inventory (PEDI). DESIGN: Using existing PEDI mobility and self-care item banks, we compared the stability of item calibrations and model fit between unidimensional and multidimensional Rasch models and compared the efficiency and precision of the U-CAT- and M-CAT-simulated assessments to a random draw of items. SETTING: Pediatric rehabilitation hospital and clinics. PARTICIPANTS: Clinical and normative samples. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Not applicable. RESULTS: The M-CAT had greater levels of precision and efficiency than the separate mobility and self-care U-CAT versions when using a similar number of items for each PEDI subdomain. Equivalent estimation of mobility and self-care scores can be achieved with a 25% to 40% item reduction with the M-CAT compared with the U-CAT. CONCLUSIONS: M-CAT applications appear to have both precision and efficiency advantages compared with separate U-CAT assessments when content subdomains have a high correlation. Practitioners may also realize interpretive advantages of reporting test score information for each subdomain when separate clinical inferences are desired. %B Archives of Physical Medicine and Rehabilitation %7 2006/08/29 %V 87 %P 1223-9 %8 Sep %@ 0003-9993 (Print) %G eng %M 16935059