Abstract
Background: The QuickDASH is a commonly used upper extremity region-specific outcome measure assessing activity limitation and symptoms. The Arabic version of QuickDASH is available in the official outcome measure website, but no prior studies have examined its psychometric properties. Objective: To examine the psychometric properties of the Arabic QuickDASH in patients with upper extremity musculoskeletal disorders. Methods: Participants with upper extremity musculoskeletal disorders were recruited (N = 109) using convenience sampling and completed the Arabic QuickDASH, Numeric Pain Rating Scale, Global Assessment of Function, and RAND 36-item Health Survey in two testing sessions (2-7 days apart). The Arabic QuickDASH structural validity, internal consistency, floor and ceiling effect, test-retest reliability, measurement error, and construct validity were examined.
Results: Exploratory factor analysis indicated a one factor underlying the Arabic QuickDASH. The Arabic QuickDASH had Cronbach's alpha of 0.90 and ICC2.1 of 0.91 indicating excellent internal consistency and testretest reliability. None of the participant reached the minimum or the maximum score. The scale's standard error of measurement and minimal detectable change were 7.0 and 16.3. Five out of the six construct validity predefined hypotheses were supported by the results.
Conclusion: The Arabic QuickDASH is a unidimensional scale with excellent internal consistency, test-retest reliability and acceptable measurement error. The Arabic Quick DASH is a valid and reliable outcome measure that can be used in Arabic speaking countries with Arabic patients suffering from various upper extremity activity limitations and symptoms.