Bifactor structure and model reliability of the Test of Gross Motor Development — 3rd edition

ObjectivesThis study investigated the structure of Test Gross Motor Development – 3rd edition (TGMD-3). Specifically, we examine bifactor structure, which simultaneously models a fundamental motor skills (FMS) general factor and specific factors for locomotor ball skills, compared to other models.DesignCross-sectional design using TGMD-3 normative sample.MethodsThe sample (N = 862) children (Mage 6.51, SD 2.23) was matched based on United States census data, ensuring appropriate percentages demographic representation disability status. Confirmatory analyses, exploratory structural equation modeling, model-based reliability estimates including coefficient omega hierarchical, hierarchical subscale, explained common variance estimates, relative parameter bias were examined.ResultsFindings revealed produced better model fit both one-factor two-factor models. Furthermore, that parceled true score FMS factor, yielded high internal consistency (.797) but not (.168) (.216). Finally, (.852–.879) (.018–.072) identified strength run, skip, slide, dribble tests represent factor.ConclusionsOur findings demonstrate advantages Additionally, these results provide further evidence an overall may explain more in performance picture evaluating children’s current levels subscales independently.