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...Cramer et al bmc musculoskeletal disorders http www biomedcentral com research article open access validation of the german version neck disability index ndi holger romy lauche jost langhorst gustav j dobos and andreas michalsen abstract background is most commonly used outcome measure for pain this study aimed to determine psychometric properties a cross cultural translation testing were performed methods item was translated into administered patients with chronic unspecific mean age years female factor structure reliability assessed using analysis cronbach s alpha split half spearman brown coefficient intra class correlation icc convergent validity intensity visual analog scale vas on movement quality life short form health survey questionnaire sf correlated range motion sensitivity change also in subsample results score revealed single that explained variance confidence interval significant correlations found r p onmovement...