Evaluation of the Psychometric Properties of Test of Gross Motor Development–3rd Edition in 7-10 year old children with intellectual disability in Tehran City

Document Type : Original Article


1 Department of Motor Behavior, Faculty of Sport Sciences, Kish International Campus, Tehran University, Tehran, Iran.

2 Department of Motor Behavior, Faculty of Sport Sciences, Tehran University, Tehran, Iran.


Background and Objective: The Test of Gross Motor Development is broadly used in research and clinical settings. The aim of study was to Evaluation of the Psychometric Properties of TGMD–3 in 7-10 year old children with intellectual disability in Tehran.
The research method was descriptive-normative. 208 children aged 7-10 years were selected by cluster sampling from Tehran. Our research tool was TGMD-3. The Factor analysis, inter-class and Pearson correlation coefficients Statistical methods were used.
The Content Validity ratio ranged from 0.60 to 1. Content Validity Index shows a range of 0.80 to 1. The internal consistency for the locomotor, ball skills subtests and total TGMD-3 was 0.75, 0.71 and 0.83 respectively. The test-retest reliability was 0.94, 0.93 and 0.94, respectively. The intra-rater reliability coefficient for the locomotor, ball skills subtests and total TGMD-3 was 0.99, 0.99 and 0.99 respectively, while inter-rater was 0.94, 0.88 and 0.95, respectively. The Correlation coefficients of the subtests with age for the locomotor, ball skills subtests and TGMD-3 was 0.64, 0.68 and 0.72 respectively. The construct validity was confirmed through confirmatory factor analysis. Characteristics of goodness were fitted in the factor of locomotor and ball skills. (χ2(78)=645.7, p=.0001, RMSEA=.02, GFI=.95, AGFI=.93, NFI=.95, NNFI=.99, CFI=1, IFI=1, SRMR=.04).
Validity and reliability of TGMD-3 in children with intellectual disability were confirmed. They can be safely used to evaluate the motor development. However, for children with other disorders, results cannot be generalized. Further studies should consider the psychometric properties of TGMD-3 in other developmental disorders.


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