Stability of the Gross Motor Function Classification System Robert J Palisano* PT ScD; David Cameron PhD (ABD), Program in Policy Decisionmaking; Peter L Rosenbaum MD FRCP(C), Department of Pediatrics; Stephen D Walter PhD, Department of Clinical Epidemiology and Biostatistics; Dianne Russell MSc, School of Rehabilitation Science, McMaster University, Hamilton, Ontario, Canada. *Correspondence to first author at Drexel University, Programs in Rehabilitation Sciences (Mail Stop 502), 245 N. 15th Street, Philadelphia, PA 19102-1192, USA. E-mail:
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The aim of this study was to assess the stability of the Gross Motor Function Classification System (GMFCS) by examining whether children with cerebral palsy (CP) remain in the same level over time. Participants were 610 children with CP (342 males, 268 females; mean age 6y 9mo [SD 2y 10mo]), range 16mo–13y). Children were assessed 2 to 7 times (mean 4.3) at 6-month (children
