Reliability and Validity of the Arabic Version of Shortened Disabilities of the Arm, Shoulder, and Hand Questionnaire (Quick-DASH) in Breast Cancer Survivors

Abstract

This study examined the psychometric properties of the Arabic Quick-Disability of the Arm, Shoulder, and Hand (QDASH-Ar) for breast cancer (BC) survivors. In this cross-sectional study, a convenient sample of 88 BC survivors was recruited and completed both the QDASH-Ar and Short Form-36 (SF-36) Arabic questionnaires. Internal consistency and test–retest reliability were assessed using Cronbach’s alpha and the two-way random intraclass correlation coefficient [ICC(2.1)], respectively. Standard error of measurement (SEM) was used to calculate the minimal detectable change (MDC). Spearman correlation coefficients were used to test construct validity between QDASH-Ar and SF-36. The results demonstrated that QDASH-Ar had a Cronbach’s alpha of 0.86 and an ICC(2.1) of 0.92. The scale’s SEM and MDC were 2.69 and 7.47, respectively. The correlation coefficients between the Quick-DASH score and the subscales of SF-36 ranged from −0.27 to −0.65, supporting the predefined hypotheses for construct validity. The discriminant validity was proven by the Quick-DASH total score between BC survivors with and without lymphedema (20.89 ± 12.78 vs. 33.63 ± 11.58, P < 0.01). In conclusion, QDASH-Ar demonstrated acceptable internal consistency, excellent test–retest reliability, and moderate to strong construct validity. Clinicians and researchers can use this valid instrument to assess and monitor upper extremity activity limitations and symptoms in BC survivors.