Test of Gross Motor Development-3 Validity and Reliability: A Screening Form

Background: The Test of Gross Motor Development-3 (TGMD-3) is used to assess locomotor (LOCS) and ball (BS) skills in children. This test provides relevant information for evaluating learning and determining teaching efficacy. However, conducting and coding the test is time consuming. A screening form may improve its usage in specific settings and populations. Purpose: This study aimed to develop a screening form for the TGMD-3-SF and examine its validity and reliability. Method: We assessed 1,192 3-to-10-year-old children; 772 children completed the TGMD-3 and 420 the TGMD-3-SF; 114 children were retested for temporal stability and 300 for criterion validity. Results: We found appropriate results for the two-factors model, LOCS (gallop, hop, and skip) and BS (one-hand strike, kick, and overhand throw), RMSEA = .025, comparative-fit index = .99, and Tukey-Lewis index = .99; internal consistency (LOCS, alpha = .60; BS, alpha =.71); item validity (LOCS, r = .43, p <.001; BS, r = .47, p < .001); interrater (ICC = .86-.99), intrarater (ICC = .61-.92), test-retest (LOCS, ICC = .87; BS, ICC = .78) reliability, and concurrent validity (LOCS, r = .89, p < .01; BS, r = .90, p < .001). Conclusions: The TGMD-3-SF is valid and reliable for assessing children's gross motor development.