title: The Relationships Between Capacity and Performance in Youths With Cerebral Palsy Differ for GMFCS Levels.
abstract: To examine change in, and longitudinal relationships between motor capacity and activity performance across the Gross Motor Function Classification System (GMFCS).
  
  
  
  Ninety-two youths with cerebral palsy were examined at 2 time points, 1 year apart, using the Gross Motor Function Measure-66 (GMFM-66) for motor capacity, and the Chinese version of the Activities Scale for Kids-Performance Version (ASKp-C) for activity performance. The score changes and capacity-to-performance/performance-to-capacity pathways were explored across GMFCS levels.
  
  
  
  The GMFM-66 scores declined over time in GMFCS levels IV-V while ASKp-C scores increased in GMFCS level I. The correlations for both pathways in GMFCS levels I, III, and IV-V were significant with a higher correlation for performance-to-capacity pathway in GMFCS levels IV-V.
  
  
  
  Longitudinal changes in and relationships between capacity and performance differ between GMFCS levels. The opportunities to perform activities need to be emphasized in GMFCS levels IV-V.
authors.affiliation: Department of Pediatric Orthopedics (Ms Ho and Dr Chia-Hsieh Chang), Chang Gung Memorial Hospital, and Graduate Institute of Early Intervention, College of Medicine, Chang Gung University & Department of Physical Medicine and Rehabilitation (Dr Hwang), Chang Gung Memorial Hospital, Linkou, (Dr Hwang), Tao-Yuan, Taiwan; and CHILD (Dr Granlund), Swedish Institute of Disability Research, School of Health Science, Jönköping University, Jönköping, Sweden.
authors.forename: Pei-Chi
authors.initials: PC
authors.lastname: Ho
authors.forename: Chia-Hsieh
authors.initials: CH
authors.lastname: Chang
authors.forename: Mats
authors.initials: M
authors.lastname: Granlund
authors.forename: Ai-Wen
authors.initials: AW
authors.lastname: Hwang
mesh_terms: D000293:Adolescent; D002547:Cerebral Palsy / Q000503:physiopathology* / Q000523:psychology / Q000534:rehabilitation; D002648:Child; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009048:Motor Skills / Q000502:physiology*