Validation of the German version of the neck disability index (NDI)

Cramer, H; Lauche, R; Langhorst, J; Dobos, GJ; Michalsen, A

Validation of the German version of the neck disability index (NDI)

Cramer, H

Lauche, R

Langhorst, J Dobos, GJ Michalsen, A

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Publication Type:: Journal Article
Citation:: BMC Musculoskeletal Disorders, 2014, 15 (1)
Issue Date:: 2014-03-19

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Field	Value	Language
dc.contributor.author	Cramer, H https://orcid.org/0000-0002-3640-8046	en_US
dc.contributor.author	Lauche, R https://orcid.org/0000-0002-4171-7935	en_US
dc.contributor.author	Langhorst, J	en_US
dc.contributor.author	Dobos, GJ	en_US
dc.contributor.author	Michalsen, A	en_US
dc.date.available	2014-03-12	en_US
dc.date.issued	2014-03-19	en_US
dc.identifier.citation	BMC Musculoskeletal Disorders, 2014, 15 (1)	en_US
dc.identifier.uri	http://hdl.handle.net/10453/41526
dc.description.abstract	Background: The Neck Disability Index (NDI) is the most commonly used outcome measure for neck pain. This study aimed to determine the psychometric properties of a German version of the NDI. Cross-cultural translation and psychometric testing of the NDI were performed. Methods. The 10-item NDI was translated into German and administered to 558 patients with chronic unspecific neck pain (Mean age 49.9 ± 11.4 years, 76% female). The factor structure and reliability of the NDI were assessed using factor analysis, Cronbach's alpha, split-half reliability (Spearman-Brown coefficient), and intra-class correlation (ICC2,1). To determine convergent validity, pain intensity (visual analog scale; VAS), pain on movement (VAS), and quality of life (Short Form 36 Health Survey Questionnaire; SF-36) were correlated with the NDI. Correlation with range of motion and sensitivity to change were also assessed in a subsample of 49 patients. Results: The mean NDI score was 32.75 ± 13.09. Factor analysis revealed a single factor that explained 39.8% of the variance. Cronbach's alpha was 0.81; Spearman-Brown coefficient was 0.80; and intra-class correlation was 0.81 (95% confidence interval = 0.78, 0.83). Significant correlations were found for pain intensity (r = 0.22, p < 0.01), pain on movement (r = 0.39, p < 0.01), quality of life (r = -0.30 to -0.45, p < 0.01), and range of motion (r = -0.34, p = 0.02). Patients who reported global improvement of health after an exercise or yoga intervention showed a higher decrease on the NDI than patients who reported no global improvement (p < 0.01). Conclusions: The German version of the NDI has a comparable factor structure as the original version, acceptable psychometric properties, and is sensitive to change after physical activity. Neck disability is associated with other measures of neck pain. © 2014 Cramer et al.; licensee BioMed Central Ltd.	en_US
dc.relation.ispartof	BMC Musculoskeletal Disorders	en_US
dc.relation.isbasedon	10.1186/1471-2474-15-91	en_US
dc.subject.classification	Orthopedics	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Neck Pain	en_US
dc.subject.mesh	Pain Measurement	en_US
dc.subject.mesh	Disability Evaluation	en_US
dc.subject.mesh	Severity of Illness Index	en_US
dc.subject.mesh	Reproducibility of Results	en_US
dc.subject.mesh	Language	en_US
dc.subject.mesh	Psychometrics	en_US
dc.subject.mesh	Head Movements	en_US
dc.subject.mesh	Quality of Life	en_US
dc.subject.mesh	Translating	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Middle Aged	en_US
dc.subject.mesh	Germany	en_US
dc.subject.mesh	Randomized Controlled Trials as Topic	en_US
dc.subject.mesh	Chronic Pain	en_US
dc.title	Validation of the German version of the neck disability index (NDI)	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	15	en_US
utslib.for	1103 Clinical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Strength - CHSP - Health Services and Practice
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	15	en_US

Abstract:

Background: The Neck Disability Index (NDI) is the most commonly used outcome measure for neck pain. This study aimed to determine the psychometric properties of a German version of the NDI. Cross-cultural translation and psychometric testing of the NDI were performed. Methods. The 10-item NDI was translated into German and administered to 558 patients with chronic unspecific neck pain (Mean age 49.9 ± 11.4 years, 76% female). The factor structure and reliability of the NDI were assessed using factor analysis, Cronbach's alpha, split-half reliability (Spearman-Brown coefficient), and intra-class correlation (ICC2,1). To determine convergent validity, pain intensity (visual analog scale; VAS), pain on movement (VAS), and quality of life (Short Form 36 Health Survey Questionnaire; SF-36) were correlated with the NDI. Correlation with range of motion and sensitivity to change were also assessed in a subsample of 49 patients. Results: The mean NDI score was 32.75 ± 13.09. Factor analysis revealed a single factor that explained 39.8% of the variance. Cronbach's alpha was 0.81; Spearman-Brown coefficient was 0.80; and intra-class correlation was 0.81 (95% confidence interval = 0.78, 0.83). Significant correlations were found for pain intensity (r = 0.22, p < 0.01), pain on movement (r = 0.39, p < 0.01), quality of life (r = -0.30 to -0.45, p < 0.01), and range of motion (r = -0.34, p = 0.02). Patients who reported global improvement of health after an exercise or yoga intervention showed a higher decrease on the NDI than patients who reported no global improvement (p < 0.01). Conclusions: The German version of the NDI has a comparable factor structure as the original version, acceptable psychometric properties, and is sensitive to change after physical activity. Neck disability is associated with other measures of neck pain. © 2014 Cramer et al.; licensee BioMed Central Ltd.

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http://hdl.handle.net/10453/41526