Interrater Reliability of the Gross Motor Scale of the Peabody Developmental Motor Scales With 4-and 5-Year-Old Children

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This study examined the interrater reliability of multiple, experienced raters on the Cross Motor Scale of the Peabody Developmental Motor Scales (PD-GMS). The Cross Motor Scale was administered to 33 children ages 4 and 5 years. One third were children without known delays and two thirds were children with identified delays who were enrolled in a public special education preschool. There were a total of 12 raters, three each in four rater groups. For data analysis, groups were pooled according to the number of children rated in each of the four groups. The intraclass correlation coefficient (ICC) statistic was used to examine interrater reliability based on total scores. For the one group of children without delay the ICC was r = 0.94. The ICC values for the two pooled groups of children with delay were: group A, r = 0.84, and group B, r = 0.93. These results indicated good reliability and no appreciable variance due to differences among therapists. The results suggest that the PD-GMS includes enough items so that the differences in total scores obtained independently by multiple experienced raters was minimal.

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