BMC Musculoskeletal Disorders (Oct 2023)
Construct validity, test–retest reliability, and responsiveness of the Arabic version of the upper limb functional index
Abstract
Abstract Background The upper limb functional index (ULFI) is a widely used self-report outcome measure questionnaire with robust psychometric properties to assess the upper limb musculoskeletal disorders (UL-MSDs). This study aimed to investigate the psychometric properties of the Arabic version of ULFI (ULFI-Ar). Methods In this observational study, 139 patients (87 male, 52 females with mean age of 38.67 ± 13.04 year) with various UL-MSD’s, completed the ULFI-Ar, Disability of Arm, Shoulder, and Hand questionnaire (DASH-Arabic), and numeric pain rating scale (NPRS-Arabic). All participants determined the factor structure, and the construct validity. A subgroup of the participants determined test–retest reliability (n = 46) and responsiveness (n = 27). Results The ULFI-Ar construct validity obtained by the expletory factor analysis as one-factor structure, demonstrated an excellent test–retest reliability [intraclass correlation coefficient (ICC2:1) = 0.95], measurement error [standard error of measurement (SEM) = 4.43%; minimal detectable change at 90% confidence interval (MDC90) = 10.34%], medium internal responsiveness [Cohen’s d = 0.62 and standard response of mean (SRM) = 0.67], strong external responsiveness DASH-Arabic (r =—0.90; p < 0.001), and negative strong correlation with NPRS-Arabic (r =—0.75, p < 0.001). Conclusions The ULFI-Ar is a valid, reliable, and responsive self-report questionnaire to assess UL-MSDs in Arabic speaking patients.
Keywords