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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2017

Open Access 01-12-2017 | Research article

Urdu version of the neck disability index: a reliability and validity study

Authors: Muhammad Nazim Farooq, Mohammad A. Mohseni-Bandpei, Syed Amir Gilani, Ambreen Hafeez

Published in: BMC Musculoskeletal Disorders | Issue 1/2017

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Abstract

Background

Despite the wide use of the neck disability index (NDI) for assessing disability in patients with neck pain, the NDI has not yet been translated and validated in Urdu. The first purpose of the present study was to translate and cross-culturally adapt the NDI into the Urdu language (NDI-U). The second purpose was to investigate the reliability, validity and responsiveness of the NDI-U in Urdu-speaking patients experiencing chronic mechanical neck pain (CMNP).

Methods

Translation and cross-cultural adaptation of the original version of the NDI were carried out using previously described procedures. Seventy-six patients with CMNP and thirty healthy participants were recruited for the study. NDI-U and visual analogue scales for pain intensity (VASpain) and disability (VASdisability) were administered to all the participants at baseline and to the patients 3 weeks after receiving physiotherapy intervention. The global rating of change scale (GROC) was also administered at this time. Test-retest reliability and internal consistency were carried out on forty-six randomly selected patients two days after they completed the NDI-U. The NDI-U was evaluated for factor analysis, content validity, construct validity (discriminative and convergent validity) and responsiveness.

Results

An intra-class correlation coefficient (ICC2,1) revealed excellent test-retest reliability for all items (ICC2,1 = 0.86–0.98) and total scores (ICC2,1 = 0.99) of the NDI-U. The NDI-U was found internally consistent with a Cronbach’s alpha of 0.90 and a fair to good correlation between single items and the NDI-U total scores (r = 0.34 to 0.89). Factor analysis of the NDI-U produced two factors explaining 66.71% of the variance. Content validity was good, as no floor or ceiling effects were detected for the NDI-U total score. To determine discriminative validity, an independent t-test revealed a significant difference in the NDI-U total scores between the patients and healthy controls (P < 0.001). For convergent validity, Pearson’s correlation coefficient showed a strong correlation between NDI-U and VASdisability (r = 0.83, P < 0.001) and a moderate correlation between NDI-U and VASpain (r = 0.62, P < 0.001). To measure responsiveness, an independent t-test showed a significant difference in the NDI-U change scores between the stable and the improved groups (P < 0.001). Furthermore, moderate correlations were found between the NDI-U change scores and the GROC (r = 0.50, P < 0.001), VASdisability change scores (r = 0.58, P < 0.001) and VASpain change scores (r = 0.55, P < 0.001).

Conclusion

The results showed that the NDI-U is a reliable, valid and responsive questionnaire to measure disability in Urdu-speaking patients with CMNP.
Appendix
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Metadata
Title
Urdu version of the neck disability index: a reliability and validity study
Authors
Muhammad Nazim Farooq
Mohammad A. Mohseni-Bandpei
Syed Amir Gilani
Ambreen Hafeez
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2017
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-017-1469-5

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