• Spine · Mar 2021

    Validation of the Nepali versions of the Neck Disability Index (NDI) and the Numerical Rating Scale (NRS) for Neck Pain.

    • Dipak Shrestha, Rohit Shrestha, Margreth Grotle, Øystein P Nygaard, and Tore K Solberg.
    • Department of Orthopaedics, Dhulikhel Hospital, Kathmandu University Hospital and Kathmandu University School of Medical Sciences, Nepal.
    • Spine. 2021 Mar 1; 46 (5): E325E332E325-E332.

    Study DesignA cross-sectional study with a test-retest design.ObjectiveTo translate and culturally adapt the numerical rating scale (NRS) for neck pain intensity and the Neck Disability Index (NDI), and asses their measurement properties in a Nepalese neck pain population.Summary Of Background DataNeck pain is one of the most common musculoskeletal disorders in Nepal. Research on neck pain disorders has been hampered by lack of standardized patient-reported outcome measures (PROMs) in Nepali language. Therefore, we aimed at validating a Nepali version of the NDI and NRS neck pain.MethodsAt Dhulikhel hospital in Nepal, 150 patients with neck pain and/or cervical radiculopathy completed the translated self-administered questionnaires. We had made one cultural adaption of the NDI driving item in the final Nepali version. Relative reliability was analyzed with intraclass correlation coefficient (ICC 2.1) and absolute reliability with the smallest detectable change (SDC). Internal consistency was assessed by Cronbach alpha. Construct and discriminative validity was assessed by Spearman correlation for a priori hypotheses, receiver-operating characteristics curves, and analysis of variance. Time spent and assistance needed to complete the questionnaires were used to assess feasibility.ResultsTest-restest reliability was excellent with ICC (95% confidence intervals) of 0.87 (0.66, 0.94) for NDI and 0.97 (0.94, 0.99) for NRS neck pain. The absolute reliability was acceptable (a SDC of 1.6 for NRS and 9.3 for NDI) and a Cronbach alpha (internal consistency) of 0.70 for NDI, as well as acceptable construct validity, discriminative validity, and feasibility.ConclusionThe Nepali versions of the NRS neck pain and NDI can be recommended for assessing pain and disability among patients with neck pain and cervical radiculopathy, but their responsiveness to change remains to be tested.Level of Evidence: 2.Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc.

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