Crosscultural Adaptation, Reliability, and Validity of the Japanese Version of the Neck Disability Index

Nakamaru, Koji; Vernon, Howard; Aizawa, Junya; Koyama, Takayuki; Nitta, Osamu

doi:10.1097/brs.0b013e318267f7f5

Cited by 35 publications

(25 citation statements)

References 25 publications

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“…The variations in the correlations between single items and total scores (0.34 to 0.89) in the present study were comparable to the results of other studies (0.40 to 0.84) [10, 25, 35]. The present study found excellent test-retest reliability, comparable to the original study and other translations [10–12, 14, 17, 19, 21–23, 28, 29, 35, 60]. However, the test-retest reliability is higher compared to the German (0.81), Dutch (0.84), Italian (0.84) and Thai (0.85) versions of the NDI [26, 27, 64, 65].…”

Section: Discussionsupporting

confidence: 90%

“…An excellent internal consistency was demonstrated by a Cronbach’s alpha value of 0.90, which is well in the range of the findings of earlier studies (0.74–0.96) [10, 12, 14, 19, 21–23, 25, 28, 29, 35, 60, 64]. The variations in the correlations between single items and total scores (0.34 to 0.89) in the present study were comparable to the results of other studies (0.40 to 0.84) [10, 25, 35].…”

Section: Discussionsupporting

confidence: 85%

“…The change in GROC scores between −3 and 3 has been described as minimal to no change [59]. Responsiveness was analysed by comparing the NDI-U change scores between these two groups with an independent t -test [29, 60]. We predicted that there would be a significant difference in the NDI-U change scores between the improved and stable groups [29, 60].…”

Section: Methodsmentioning

confidence: 99%

“…Responsiveness was analysed by comparing the NDI-U change scores between these two groups with an independent t -test [29, 60]. We predicted that there would be a significant difference in the NDI-U change scores between the improved and stable groups [29, 60]. We also assessed responsiveness by correlating the NDI-U change scores to the GROC [21, 29] and by correlating the change scores of the NDI-U with the change scores of the VAS pain and VAS disability [57].…”

Section: Methodsmentioning

confidence: 99%

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

Farooq

Mohseni-Bandpei

Gilani

et al. 2017

BMC Musculoskelet Disord

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BackgroundDespite 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).MethodsTranslation 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.ResultsAn 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).ConclusionThe results showed that the NDI-U is a reliable, valid and responsive questionnaire to measure disability in Urdu-speaking patients with CMNP.Electronic supplementary materialThe online version of this article (doi:10.1186/s12891-017-1469-5) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

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

Farooq

Mohseni-Bandpei

Gilani

et al. 2017

BMC Musculoskelet Disord

View full text Add to dashboard Cite

show abstract

“…It was used to test the convergent validity of the PSFS in this study. The psychometric properties of the Japanese version of the NDI have been well documented [8].…”

Section: Neck Disability Indexmentioning

confidence: 99%