The Japanese Version of the Quality of Upper Extremity Skills Test.

To improve upper-limb function in children with cerebral palsy (CP), adequate assessment tools are essential for rehabilitation; however, there have been very few assessment tools with acceptable validity and reliability for use in Japan to date. The aim of this study was to describe the process of translating the Quality of Upper Extremity Skills Test (QUEST) into Japanese and to examine its psychometric properties. The QUEST was translated using a forward-backward method. Sixty-one children aged 2-18 years with a diagnosis of CP underwent assessment, with video-based reliability assessments conducted for 38 of them. The intra-class correlation coefficients were 0.94 for inter-rater reliability and 0.97 for intra-rater reliability. The total score showed a strong correlation with the Manual Ability Classification System (ρ = -0.65). A questionnaire of experts showed generally good content validity. The Japanese version of the QUEST was found to be both valid and reliable.