Cramer Holger, Lauche Romy, Langhorst Jost, Dobos Gustav J, Michalsen Andreas
Department of Internal and Integrative Medicine, Kliniken Essen-Mitte, Faculty of Medicine, University of Duisburg-Essen, Am Deimelsberg 34a, 45276 Essen, Germany.
BMC Musculoskelet Disord. 2014 Mar 19;15:91. doi: 10.1186/1471-2474-15-91.
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.
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.
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).
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.
颈部功能障碍指数（NDI）是颈部疼痛最常用的疗效指标。本研究旨在确定NDI德文版的心理测量特性。对NDI进行了跨文化翻译和心理测量测试。
将10项的NDI翻译成德文，并应用于558例慢性非特异性颈部疼痛患者（平均年龄49.9±11.4岁，76%为女性）。使用因子分析、克朗巴哈系数、分半信度（斯皮尔曼-布朗系数）和组内相关系数（ICC2,1）评估NDI的因子结构和信度。为确定收敛效度，将疼痛强度（视觉模拟量表；VAS）、运动时疼痛（VAS）和生活质量（简短健康调查36项问卷；SF-36）与NDI进行相关性分析。还在49例患者的子样本中评估了与运动范围和变化敏感性的相关性。
NDI平均得分为32.75±13.09。因子分析显示一个单一因子解释了39.8%的方差。克朗巴哈系数为0.81；斯皮尔曼-布朗系数为0.80；组内相关系数为0.81（95%置信区间=0.78,0.83）。发现疼痛强度（r = 0.22，p < 0.01）、运动时疼痛（r = 0.39，p < 0.01）、生活质量（r = -0.30至-0.45，p < 0.01）和运动范围（r = -0.34，p = 0.02）之间存在显著相关性。报告在运动或瑜伽干预后整体健康状况改善的患者，其NDI下降幅度高于报告无整体改善的患者（p < 0.01）。
NDI德文版具有与原版可比的因子结构、可接受的心理测量特性，并且对体育活动后的变化敏感。颈部功能障碍与其他颈部疼痛指标相关。
