Cross-cultural adaptation and validation of the Amharic version of Roland Morris Disability Questionnaire in people with low back pain in Ethiopia

Abstract

Purpose Cross-culturally translate, adapt, and validate Roland Morris Disability Questionnaire (RMDQ) in Amharic language in Ethiopia. Methods The English version RMDQ was translated into Amharic and back-translated into English. An expert review committee reviewed the translations and created Amharic version of the RMDQ (RMDQ-Am). Pilot testing and cognitive debriefing of the RMDQ-Am were conducted with a sample of 20 individuals with LBP. The RMDQ-Am was administered to 240 individuals with LBP from three rehabilitation centers to determine its psychometric properties. Internal consistency of the tool was determined by Cronbach’s alpha. Test-retest reliability was determined by the Intraclass correlation coefficient. The Standard Error of Measurement (SEM), Minimum Detectable Change (MDC), and the Bland Altman Limit of Agreement (LOA) was also determined. The Short-Form Health Survey (SF-36) Bodily Pain and Physical Functioning subscales were used to assess convergent validity. Exploratory Factor Analysis (EFA) was used to determine the dimensionality of the tool. Results RMDQ-Am demonstrated good internal consistency (α = 0.88), excellent test-retest reliability (ICC = 0.91), SEM (1.64), MDC (3.55), and good LOA. There is a significant moderate correlation between RMDQ-Am and the Physical Functioning (Rho = −0.62, p < 0.01) and Bodily Pain (BP) (Rho = −0.41, p < 0.01) subscales of the SF-36. Exploratory Factor Analysis demonstrates that the Amharic version of RMDQ is a primary one and secondary four-factor model [The Kaiser Meyer Olkin = 0.877, X 2 (df) =1413.278/190, p < 0.001]. Conclusion RMDQ-Am is a reliable and valid tool that can be used in both clinical practice and research with the Ethiopian LBP population. IMPLICATION FOR REHABILITATION Despite LBP being a concern in Ethiopia, the magnitude of disability related to this phenomenon is not studied in the country, mainly due to the absence of validated LBP specific patient-reported outcome measures such as the Roland Morris Disability Questionnaire (RMDQ). The RMDQ was successfully translated, adapted, and validated into the Amharic language and the Ethiopian context (RMDQ-Am). The RMDQ-Am is a reliable outcome measure among the Ethiopian population with LBP, as demonstrated by the good internal consistency (α = 0.88) and excellent test-retest reliability (ICC = 0.91). There is a moderate negative correlation between the RMDQ-Am and the Physical Functioning (Rho = −0.62, p < 0.01) and Bodily Pain (Rho = −0.41, p < 0.01) subscales of the SF-36. The RMDQ-Am can be used in clinical and research settings to measure LBP-related disability and its impact among individuals living with LBP in Ethiopia.