• Namfon Mahasup, Paskorn Sritipsukho, Raweewan Lekskulchai, and Piyapa Keawutan.
• Postgraduate Studies Program, Faculty of Medicine, Thammasat University, Pathumthani, Thailand.
• J Med Assoc Thai. 2011 Dec 1;94 Suppl 7:S139-44.

ObjectiveThe present study aimed to determine inter-rater reliability and intra-rater reliability of the 66-item version of the Gross Motor Function Measure (GMFM-66) in assessing motor ability of Thai children with cerebral palsy.Material And MethodTen children, aged 2-10 years, were recruited in the present study. Eight children with spastic diplegia from an outpatient department of Thammasat University Hospital, and two normal children were recruited. The motor abilities of the subjects were recorded on a video camera. Three pediatric physical therapists independently watched the video recordings and scored each child according to the GMFM assessment. The video clips often children were assessed on two occasions at an interval of one week by the same therapists. The inter-rater and intra-rater reliability were analyzed using an intraclass correlation coefficient (ICC).ResultsThe inter-rater reliability and intra-rater reliability of the GMFM-66 were both high. The ICC for inter-rater reliability was 0.93 and for intra-rater reliability were 0.99-1.00 for the total scores.ConclusionThe present study confirms high inter-rater and intra-rater reliability of the GMFM-66 measured by Thai pediatric physical therapists. Therefore, in clinical practice, we recommend Thai pediatric physical therapists to use the GMFM-66 in assessing motor ability of cerebral palsy patients.

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