Abstract

In the cohort of patients attending pain clinic, the primary goal has been shifting from pain reduction to improving activities of daily living and functional status. The 12-item World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0) is one of the useful tools for assessment of functional status across all psychiatric and medical diseases; however, its feasibility, reliability, and validity have not been assessed in these patients. Thus, in this study, we evaluated the feasibility, reliability, and validity of the 12-item WHODAS 2.0 in patients attending the pain clinic at our university hospital. This is a prospective observational study including the patients aged 50years or older who were attending the pain clinic at Nara Medical University between April 2019 and May 2019. Patient-related outcomes including functional status and activities of daily living were assessed with the 12-item WHODAS 2.0, EuroQol-5 dimension 5 levels, and the Tokyo Metropolitan Institute of Gerontology Index. The response rate was 99.7%. The 12-item WHODAS2.0 had a floor effect but no ceiling effect and its Cronbach's α coefficient was 0.909. The correlation coefficients between the 12-item WHODAS 2.0 score and the EuroQol-5 dimension 5 levels and the Tokyo Metropolitan Institute of Gerontology Index were -0.66 and -0.67, respectively. The 12-item WHODAS 2.0 is a useful measurement tool to assess disability of pain patients with high reliability and validity.

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