The PEDI is a judgment-based, standardized instrument using parent report through a structured interview. It was administered by independent evaluators (the same evaluator each time) who were trained in its use and who did not know the treatment allocation. The PEDI measures both capability and performance of functional activities in daily life situations in 3 domains: (1) self-care, (2) mobility, and (3) social function. Because the focus of our study was on the children’s motor abilities, the social function domain is not dis- cussed in this article. Capability is measured by the identification of functional skills the child has mastered. For this functional skills scale, the parent indicates whether the child is capable of performing each of 197 specific tasks in the 3 domains. Performance of daily functional activities is measured by the level of caregiver assistance the child needs to accomplish major functional activities and by the number of modificationsoramount of adaptive equipment the child uses within each domain. The caregiver assistance scale measures the extent of help the caregiver provides in typical daily situations. The amount of assistance in 20 daily activities is assessed on a 6-point scale ranging from “total assistance” to “independence.”