Abstract
Nordic is one of the most popular questionnaires for evaluating Work-related Musculoskeletal Disorders (WMSDs), but no studies have been reported on the reliability and validity of this questionnaire in Iran. The aim of this study was translation, cross-cultural adaptation and validation of the Persian version of the Specific Nordic questionnaire (SNQ), and evaluation of the reliability of this questionnaire for the assessment of WMSDs in Iranian industrial workers. The SNQ was completed by 122 Iranian industrial workers with lumbar or knee musculoskeletal disorders to assess the reliability and construct validity. The validity was assessed by knee injury and Osteoarthritis Outcome Score (KOOS) and Oswestry Disability Index (ODI) questionnaires. Reliability was assessed by a test-retest procedure for 60 patients with 7-days interval. There was significant positive correlation between KSNQ and KOOS pain (r = 0.71, p < 0.05) and the KSNQ and KOOS QOL (r = 0.72, p < 0.05). There was High Pearson correlation between LSNQ and ODI (r = 0.77, p < 0.05). Both lumbar and knee SNQ had a high Kappa coefficient correlation (0.83-1 for KSNQ and 0.63-1 for LSNQ). The Persian version of the SNQ is a reliable and valid instrument to be used for the assessment of WMSDs in Iranian industrial workers.
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