Validity and reliability of the Persian version of shortened disabilities of the arm, shoulder and hand questionnaire (quick-DASH)

Abstract

Background: The aim was to assess the validity and reliability of the Persian version of shortened disabilities of the arm, shoulder, and hand (Quick-DASH) questionnaire in patients with upper extremity conditions. Methods: We administered the Persian version of Quick-DASH to 202 patients with upper extremity conditions, of which 71 patients randomly returned after 3 days to respond to the questionnaire for the 2 nd time. In order to test the construct validity of the questionnaire, patients responded to the Michigan Hand Outcome Questionnaire (MHOQ) and Short Form 36 Health Survey (SF-36) as well. Internal consistency was tested using the Cronbach′s alpha, and test-retest reliability was measured using intra-class correlation coefficient (ICC). Results: Cronbach′s alpha was 0.90. ICC was 0.89. Convergent validity was confirmed, as the Spearman correlation between the Quick-DASH and MHOQ was 0.67 and ranged from 0.24 to 0.56 between the subscales of the SF-36 and Quick-DASH. Conclusions: Observation of excellent internal consistency, good to excellent test-retest reliability, and moderate to strong construct validity confirms the validity and reliability of the Persian version of Quick-DASH for evaluating the magnitude and level of disability in upper extremity conditions.

Keywords

• Persian
• psychometric
• Quick-disabilities of the arm
• shoulder and hand
• reliability
• validity