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Tabulated reference percentiles are available for use with the GMFM-66 to assess children with cerebral palsy. The percentiles are presented by GMFCS levels, and are suitable for scientific or clinical use in conjunction with the GMFM-66 manual. The percentiles are derived from a longitudinal sample of 1940 GMFM-66 assessments of 650 children with CP, 2 - 12 years of age. This stratified (by age and GMFCS) random sample was collected from among all children with CP who were receiving a variety of developmental therapies and services at publicly funded children's rehabilitation centres in Ontario, Canada, between 1996 and 2001.
The development and appropriate use of these percentiles is described in:
Hanna, S.E., Bartlett, D.J., Rivard, L.M., & Russell, D.J. (2008). Reference curves for the Gross Motor Function Measure: Percentiles for clinical description and tracking over time among children with cerebral palsy. Physical Therapy 88(5) 596 - 607.
