Psychometric properties of the Affordances in the Home Environment for Motor Development inventory for use with Iranian children aged 18-42 months.

Objective: The aim of this study was to translate the original English language version of the Affordances in the Home Environment for Motor Development (AHEMD) inventory and test its psychometric properties for use with Iranian children aged 18-42 months.
Methods: For this purpose, the tool was translated into Farsi (a Persian language) using the forward-backward translation method and some of its psychometric properties were examined. Multistage stratified-cluster sampling was used to study 1019 families having children aged 18-42 months from among the regional divisions of Tehran urban community health centers. The questionnaire evaluated five factors: outside space, inside space, variety of stimulation, fine motor toys and gross motor toys. Expert opinion was used for content-related validity evaluation and confirmatory factor analysis was used to determine construct validity. For test-retest reliability, parents completed identical questionnaires two weeks apart. Internal consistency was evaluated using inter-examiner reliability, Cronbach's alpha and construct reliability. Linear regression analysis was used to explain and predict the effects of toys on AHEMD total score.
Results: Results showed that content-related validity was 0.92. Data confirmatory factor analysis showed an acceptable fit to the original five factors. Reliability over time was 0.91 and internal consistency was 0.93. It was also found that fine- and gross-motor toys showed a significant 55% predictability of affordance provision in the home.
Conclusion: The Farsi translation of the AHEMD is acceptable for use with Iranian children aged 18-42 month.
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