Construct validity of the Persian version of the Child Occupational Self-Assessment in children with attention-deficit/hyperactivity disorder in Iran

OBJECTIVE: This study aimed to assess the construct validity of the Child Occupational Self-Assessment, translated to Persian that could provide occupational therapists with a tool to evaluate occupational competence and values of children in Iran. METHODS: A total of 250 children (87 girls and 163 boys) with attention deficit hyperactivity disorder aged 7.5–11 years referred from two specialised children’s hospitals were included. The researchers read the questions to the children and they identified their own answers. The data were analysed based on the Rasch Rating Scale Model. RESULTS: Four of the items showed misfit and as a result of deleting these items the Persian version of the questionnaire has 21 items with an appropriate validity. CONCLUSION: The Persian version of Child Occupational Self-Assessment can be used with new items format. It could be also useful to replace the missing question to develop the tool further.