Reliability of the test of gross motor development second edition for children with Down syndrome


  • Myo Thein Tun University of Medical Technology, Yangon
  • Thanda Aye University of Medical Technology, Yangon
  • Thwe Zar Chi Htut University of Medical Technology, Yangon
  • Wai Mar Tin
  • Myo Thuzar Khin University of Medical Technology, Yangon


Children with Down syndrome, Reliability, TGMD-2


Objective: To investigate the test of gross motor development second edition (TGMD-2) test-retest, inter-rater, and intra-rater reliability for children with Down syndrome (DS).

Materials and Methods: The School for Disabled Children in Yangon provided 50 volunteers with DS for this reliability research. Before the assessment, all participants received an explanation of the TGMD-2 and saw all the skills in action. Each FMS had to be used twice for actual scoring, and each participant received one practice trial. The principal researcher videotaped and documented each participant's performance. The three raters watched and independently rated the recorded videos to assess inter-rater reliability. Test-retest reliability was assessed a second time two weeks later. For intra-rater reliability, the principal researcher reevaluated the identical video recordings from the initial evaluation four weeks later. Reliability was assessed using intraclass correlation coefficients (ICC) and Cronbach's alpha.

Results: The gross motor quotient, object control raw scores, and locomotor raw scores showed strong reliability coefficients.

Conclusion: Therefore, the TGMD-2 is an appropriate and highly reliable method to measure the FMS of children with DS, it can be inferred from the current findings.


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How to Cite

Thein Tun M, Aye T, Zar Chi Htut T, Mar Tin W, Thuzar Khin M. Reliability of the test of gross motor development second edition for children with Down syndrome. J. Med. Glob. [Internet]. 2023 Jan. 21 [cited 2023 Feb. 6];1(3):134-41. Available from: