Cross-cultural translation, validity and reliability of the Turkish version of the Northwick Park Neck Pain Questionnaire

Abstract

Abstract Objective The aim of this study was to translate the Northwick Park Neck Pain Questionnaire (NPQ) into the Turkish language and assess its reliability and validity among patients with neck pain in the Turkish population. Methods One hundred subjects (67 female, 33 male) who had chronic neck pain for at least 3 months were included in this study. All participants were asked to complete the NPQ, the Neck Disability Index (NDI) and Neck Pain and Disability Scale (NPDS) on the day of admission, and one week later. The test-retest and internal consistency analyses were applied for the assessment of reliability. The test-retest analysis were assessed by using the Intraclass Correlation Coefficient (ICC) method (95% confidence interval). The value of Cronbach’s alpha coefficient was calculated for internal consistency. Spearman’s correlation coefficient analysis was used for convergent validity. Results The mean age was 46.68 ± 12.11 years in the study. The NPQ had a good internal consistency (Cronbach alfa = 0.704) and excellent test-retest reliability (Intraclass correlation coefficient = 0.995). Spearman’s correlation coefficient of the NPQ with the NDI was calculated at 0.648 and Spearman’s correlation coefficient of the NPQ with the NPDS was calculated at 0.811. These results showed that the NPQ is very good correlated with the NDI and the NPDS (p < 0.001). Conclusion Our results suggest that the Turkish version of the NPQ is a reliable and valid instrument for Turkish people.