• Spine · Jul 2015

    The Neck Disability Index-Russian Language Version (NDI-RU): A Study of Validity and Reliability.

    • Maxim A Bakhtadze, Howard Vernon, Olga B Zakharova, Kirill O Kuzminov, and Dmitry A Bolotov.
    • *Department of Neurology, Neurosurgery and Medical Genetics, Russian National Research Medical University (named after N. I. Pirogov), and Department of Manual Therapy, Center for Manual Therapy, Moscow, Russia †Canadian Memorial Chiropractic College, Toronto, Ontario, Canada; and ‡Department of Physiotherapy, Moscow City Hospital, Moscow, Russia.
    • Spine. 2015 Jul 15;40(14):1115-21.

    Study DesignCross-cultural adaptation and psychometric testing.ObjectiveTo perform a validated Russian translation and then to evaluate the validity and reliability of the Russian language version of the Neck Disability Index (NDI-RU).Summary Of Background DataNeck pain is highly prevalent and can greatly affect daily activity. The Neck Disability Index (NDI) is the most frequently used scale for self-rating of disability due to neck pain. Its translated versions are applied in many countries. However, the Russian language version of the NDI has not been developed yet.MethodsCross-cultural adaptation of the NDI-RU was performed according to established guidelines. Then, the NDI-RU was evaluated for content validity, concurrent criterion validity, internal consistency, test-retest reliability, factor structure, and minimum detectable change.ResultsTwo hundred thirty-two patients took part in the study in total: 109 in validity (39.5 ± 10 yr), 123 in reliability (38.4 ± 11 yr; 80 in the test-retest phase). A culturally valid translation was achieved. NDI-RU total scores were distributed normally. Floor/ceiling effects were absent. Good values of Cronbach α were obtained for each item (from 0.80 to 0.84) and for the total NDI-RU (0.83). A 2-factor solution was found for the NDI-RU. The average interitem correlation coefficient was 0.53. Intraclass correlation coefficients for test-retest reliability coefficients ranged from 0.65 to 0.92 for different items and 0.91 for the total NDI-RU. Moderate correlation (Spearman rs = 0.62; P < 0.05) was found between the NDI-RU total score and graphic rating scalepain score. Completion of the NDI-RU takes 3.6 ± 1 minutes.ConclusionThe development of a Russian language version of the Neck Disability Index resulted in a valid, reliable instrument that can be used both in clinical practice and scientific investigations.Level Of Evidence1.

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