Cross-cultural adaptation and psychometric properties of the Thai version of the University of Washington - Pain Related Self-Efficacy Scale 6 (UW-PRSE6)

Abstract

Objective: To cross-culturally adapt the University of Washington Pain related Self-Efficacy Scale (UW-PRSE6) into Thai and evaluate its psychometric properties. Methods: The original UW- PRSE6 was cross-culturally adapted using the Functional Assessment of Chronic Illness Therapy translation methodology. 241 individuals with chronic low back pain completed the Thai version of UW-PRSE6 (T-UW-PRSE6), Thai Fear Avoidance Beliefs Questionnaire (T-FABQ), and Thai Medical Outcome Study Short-Form 36 (T-SF-36). 241 participants completed the T-UW-PRSE6 and again after 7-days interval. 152 participants rated their overall condition as having little to no change at the second assessment. Cronbach’s alpha and intraclass correlation coefficients were calculated to estimate internal consistency and test-retest reliability, respectively. Construct validity of the T-UW-PRSE6 were also evaluated. Results: The T-UW-PRSE6 had good internal consistency (Cronbach’s a = 0.85) and moderate test-retest reliability (ICC [2,1] = 0.72). The T-UW-PRSE6 was positively correlated with the General Health, Physical Functioning, Role Physical, Role Emotional, Social Functioning, Bodily Pain, Vitality, and Mental Health scales of the T-SF-36 (rs = 0.38, 0.42, 0.54, 0.51, 0.47, 0.54, 0.41 and 0.40, respectively) and negatively correlated with the T-FABQ Work and Physical Activity Subscales (rs = -0.34 and -0.34, respectively)

Conclusions: The T-UW-PRSE6 was cross-culturally adapted to Thai and acceptable psychometric properties for assessing pain-related self-efficacy in individuals with chronic low back pain.