The "Gross Motor Function Measure" (GMFM-88) is a commonly used measure for evaluating gross motor function in children with cerebral palsy (CP). The relative reliability of GMFM-88 has been assessed in children with CP. However, little information is available about the absolute reliability or responsiveness of GMFM-88.
The objective of this research was to determine the absolute and relative reliability and responsiveness of the GMFM-88 in evaluating gross motor function in children with CP.
A clinical measurement design.
Ten raters scored GMFM-88 of 84 children from video records across all GMFCS levels to establish inter-rater reliability. Two raters participated to assess intra-rater reliability. Responsiveness was determined from three additional assessments after the baseline assessment. The inter- and intra-rater intraclass correlation coefficient (ICC) with 95% confidence intervals, standard error of measurement (SEM), smallest real difference (SRD), effect size (ES), and standardized response mean (SRM) were calculated.
The relative reliabilities of the GMFM were excellent (ICCs = 0.986-1.000). The SEM and SRD for total score of the GMFM were acceptable (1.60 and 3.14, respectively). Additionally, the goal total scores of the ES and SRM increased gradually in the three follow-up assessments (GMFCS level I–II: ES = 0.5, 0.6, and 0.8, SRM = 1.3, 1.8, and 2.0; GMFCS III–V: ES = 0.4, 0.7, and 0.9, SRM = 1.5, 1.7, and 2.0).
Children over 10 years of age with CP were not included in this study, so the results should not be generalized to all children with CP.
This study indicates that both reliability and responsiveness of the GMFM-88 are reasonable for measuring gross motor function in children with CP.
Source: http://ptjournal.apta.org/cgi/content/short/ptj.20110374v1?rss=1
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