Test–retest reliability of the Test of Gross Motor Development-3 instrument for children with Down syndrome

Background: The Test of Gross Motor Development-3 (TGMD-3 2019) evaluates fundamental gross motor skills across two domains: locomotor and ball skills. Objectives: The purpose of this study was to determine the test-retest reliability of the TGMD-3 in children with Down syndrome. Method: Twenty-four children with Down syndrome, aged 9-15 years, from five special needs schools in the North West province of South Africa participated in this study. Results: = 0.321) were not significant. Conclusion: The TGMD-3 instrument showed good to excellent test-retest reliability for assessing gross motor skills in children with Down syndrome. Contribution: This study provides an initial reliability analysis of the TGMD-3 instrument amongst selected children with Down syndrome in five districts of the North West province of South Africa.