Scores on the PEDI were based on a 45-min to 60-min interview with each subject's primary caregiver. The primary caregiver was asked to identify which functional skills the subject performed consistently or with competence. Because the PEDI scores were based on the primary caregiver's judgment of performance, the results reflected the subject's abilities across environments and not his or her performance at one point in time. Items involved several performance components, including fine motor skills. The Self-Care Scale, in particular, is based on items that require fine motor skills (e.g., dressing, bathing, and fastening). The Mobility Scale includes some items that involve fine motor skill (e.g., carries objects, manages seat belt and car door, and moves objects on floor). The Social Function Scale includes items that measure play with toys and objects and performance of household chores.