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Improved Scaling of the Gross Motor Function Measure for Children With Cerebral Palsy: Evidence of Reliability and Validity
Journal article   Open access   Peer reviewed

Improved Scaling of the Gross Motor Function Measure for Children With Cerebral Palsy: Evidence of Reliability and Validity

Dianne J Russell, Lisa M Avery, Peter L Rosenbaum, Parminder S Raina, Stephen D Walter and Robert J Palisano
Physical therapy, v 80(9), pp 873-885
01 Sep 2000
PMID: 10960935
url
https://doi.org/10.1093/ptj/80.9.873View
Published, Version of Record (VoR) Open

Abstract

Abstract Background and Purpose. This study examined the reliability, validity, and responsiveness to change of measurements obtained with a 66-item version of the Gross Motor Function Measure (GMFM-66) developed using Rasch analysis. Subjects and Methods. The validity of measurements obtained with the GMFM-66 was assessed by examining the hierarchy of items and the GMFM-66 scores for different groups of children from a stratified random community-based sample of 537 children with cerebral palsy (CP). A subset of 228 children who had been reassessed at 12 months was used to test the hypothesis that children who are young (<5 years of age) and have “mild” CP will demonstrate greater change in GMFM-66 scores than children who are older (≥5 years of age) and whose CP is more severe. Data from an additional 19 children with CP who were assessed twice, one week apart, were used to examine test-retest reliability. Results. The overall changes in GMFM-66 scores over 12 months and a time × severity × age interaction supported our hypotheses. Test-retest reliability was high (intraclass correlation coefficient=.99). Conclusion and Discussion. This study demonstrated that the GMFM-66 has good psychometric properties. By providing a hierarchical structure and interval scaling, the GMFM-66 can provide a better understanding of motor development for children with CP than the 88 item GMFM and can improve the scoring and interpretation of data obtained with the GMFM.

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515 citations in Scopus

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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Orthopedics
Rehabilitation
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