Test of Gross Motor Development: expert validity, confirmatory validity and internal consistence

Abstract

 The Test of Gross Motor Development (TGMD-2) is an instrument used to evaluate children’s level of motor development. The objective of this study was to translate and verify the clarity and pertinence of the TGMD-2 items by experts and the confirmatory factorial validity and the internal consistence by means of test-retest of the Portuguese TGMD-2. A cross-cultural translation was used to construct the Portuguese version. The participants of this study were 7 professionals and 587 children, from 27 schools (kindergarten and elementary) from 3 to 10 years old (51.1% boys and 48.9% girls). Each child was videotaped performing the test twice. The videotaped tests were then scored. The results indicated that the Portuguese version of the TGMD-2 contains clear and pertinent motor items; demonstrated satisfactory indices of confirmatory factorial validity (÷2/gl = 3.38; Goodness-of-fit Index = 0.95; Adjusted Goodness-of-fit index = 0.92 and Tucker and Lewis’s Index of Fit = 0.83) and test-retest internal consistency (locomotion r = 0.82; control of object: r = 0.88). The Portuguese TGMD-2 demonstrated validity and reliability for the sample investigated.