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Objective  To determine the convergent validity and responsiveness of the work functioning impairment scale (WFun) in workers with musculoskeletal disorder‐related pain.    Methods  Participants were extracted from an internet user study and prospectively examined using the pain intensity numerical rating scale (pain‐NRS), the work ability numerical rating scale (productivity‐NRS), and the WFun at baseline, 2 weeks, 6 weeks, and 3 months. The convergent validity and responsiveness of the WFun were examined by multilevel regression analysis.    Results  A total of 786 workers participated and 593 completed all surveys. The WFun score gradually increased and decreased as the pain‐NRS and the productivity‐NRS increased, respectively. Changes in the WFun score steadily increased and decreased as changes in the pain‐NRS and the productivity‐NRS increased, respectively. Multilevel analyses showed that all linear associations were significant.    Conclusions  The convergent validity and responsiveness of the WFun were consistent with the expected direction and magnitude.

Validity and responsiveness of the work functioning impairment scale (WFun) in workers with pain due to musculoskeletal disorders