Validation of the German version of the Neck Disability Index (NDI)

BMC Musculoskeletal Disorders

Andreas Michalsen¹  Gustav J Dobos²  Jost Langhorst²  Romy Lauche²  Holger Cramer² 

[1]Institute for Social Medicine, Epidemiology, and Health Economics, Charité University Medical Center, Königstraße 63, 14109 Berlin, Germany

[2]Department of Internal and Integrative Medicine, Kliniken Essen-Mitte, Faculty of Medicine, University of Duisburg-Essen, Am Deimelsberg 34a, 45276 Essen, Germany

关键词: Sensitivity to change;    Factor structure;    Reliability;    Validity;    German;    Translation;    Neck disability index;    Disability;    Chronic pain;    Neck pain;   

Others  :  1127832
DOI  :  10.1186/1471-2474-15-91

 received in 2013-08-29, accepted in 2014-03-12,  发布年份 2014

【 摘 要 】

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 (ICC_2,1). 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.

【 授权许可】

   
2014 Cramer et al.; licensee BioMed Central Ltd.

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