NMSK II Pediatric Outcome Measures Practice Test

Which statement best describes the difference in output between GMFM-66 and GMFM-88?

GMFM-66 yields a single interval score via Rasch analysis. GMFM-66 yields a single interval score via Rasch analysis, while GMFM-88 provides separate dimension scores and a total percent score from 88 items. GMFM-66 uses a fixed total percent score from 66 items. GMFM-66 is designed for infants and GMFM-88 for adolescents.

Correct Answer:

GMFM-66 yields a single interval score via Rasch analysis, while GMFM-88 provides separate dimension scores and a total percent score from 88 items.

Explanation:

Rasch analysis is used to place responses on a single, linear scale, turning observed performance into an interval measurement of gross motor function. The GMFM-66 uses 66 items that fit this unidimensional Rasch model, so it yields one overall interval score that represents the child’s gross motor ability on a continuous scale. In contrast, the GMFM-88 includes all 88 items arranged into five functional dimensions and provides scores for each dimension plus a total percentage score across all items. That means its outputs are multi-dimensional rather than a single interval estimate. So the difference in output is that the GMFM-66 yields a single interval score, while the GMFM-88 provides separate dimension scores and a total percent score from 88 items.

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