Objective: To investigate the agreement between live and video scores of the Gross Motor Function Measure-88.
Design: Reliability study.
Subjects: Forty children with bilateral spastic cerebral palsy.
Interventions: Fifty evaluations were administered according to the test guidelines, and were videotaped. After a minimum interval of one month, the video recordings were again rated by the same assessor. Two physical therapy students also each scored the recordings twice, with a minimal interval of one month.
Main Measures: Agreement between live and video scores as well as inter-rater and intra-rater agreement of the video scores were assessed using intra-class correlation coefficients (ICC), standard error of measurements (SEM), and smallest detectable changes (SDC). Weighted kappa coefficients were used to analyse individual items.
Results: The live and video scores from the same assessor showed good to very good agreement for the total score (ICC, 0.973; SEM, 2.28; SDC, 6.32) and dimensions B (ICC, 0.938), D (ICC, 0.965), and E (ICC, 0.992) but lower agreement for A (ICC, 0.720) and C (ICC, 0.667). Live-versus-video agreement for the total score was higher than inter-rater agreement by video (ICC, 0.949; SEM, 3.15; SDC, 8.73) but lower than intra-rater agreement by video (ICC, 0.989; SEM, 1.42; SDC, 3.96).
Conclusion: The Gross Motor Function Measure-88 can be reliably scored using video recordings. The agreement between live and video scores is lower than the intra-rater reliability using video recordings only. Future clinical trial results should be interpreted using the appropriate SEM and SDC values.
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