Johansen Jan Borre, Roe Cecilie, Bakke Eva, Mengshoel Anne Marit, Andelic Nada
Department of Physical Medicine and Rehabilitation, Oslo University Hospital, Oslo, Norway.
Faculty of Medicine, University of Oslo, Oslo, Norway.
Scand J Pain. 2014 Jan 1;5(1):28-33. doi: 10.1016/j.sjpain.2013.10.001.
Background and aim The Norwegian version of the Neck Disability Index (NDI) has been widely used in previous studies. To our knowledge, the test-retest reliability and responsiveness of the NDI have not been investigated. Thus, the aim of the present study was to investigate the test-retest reliability and responsiveness of the Norwegian version of the NDI in neck pain patients seen in a specialized outpatient clinic. Methods This study included patients referred to the neck and back outpatient clinic at Oslo University Hospital. A total of 255 patients were included in the study, of which 42 participated in the test-retest portion of the study. The intraclass correlation coefficient (ICC) was used to assess test-retest reliability. A total of 113 patients participated in the responsiveness analyses. Based on their responses on the Global Rating Scale of Change (GRS), patients were categorized into the following groups: worsened (n = 24), unchanged (n = 7) and improved (n = 62). The minimal detectable change (MDC) for the NDI was calculated. Responsiveness was assessed by constructing a Receiver Operating Characteristic curve (ROC curve) to distinguish patients who had improved or worsened from those who remained unchanged. The minimum clinically important difference (MCID) was estimated. Results The test-retest reliability between the baseline scores and the retest NDI scores was very good (ICC = 0.84; 95% CI 0.72-0.91). The ability of the NDI to discriminate between improved and unchanged patients (responsiveness) over time was acceptable based on the ROC curve analysis (AUC = 0.70; 95% CI 0.58-0.82). The estimated MDC for the Norwegian version of the NDI is 12.3%, and the MCID is 16.6%. Conclusion The Norwegian version of the NDI proved to be an instrument with good test-retest reliability and acceptable responsiveness for assessing neck pain-related disability among neck pain patients in a specialized outpatient clinic.
背景与目的 挪威版颈部功能障碍指数（NDI）在以往研究中已被广泛使用。据我们所知，NDI的重测信度和反应度尚未得到研究。因此，本研究的目的是调查挪威版NDI在一家专科门诊就诊的颈部疼痛患者中的重测信度和反应度。方法 本研究纳入了转诊至奥斯陆大学医院颈部和背部门诊的患者。共有255名患者纳入研究，其中42名参与了研究的重测部分。组内相关系数（ICC）用于评估重测信度。共有113名患者参与了反应度分析。根据他们在整体变化评定量表（GRS）上的回答，患者被分为以下几组：病情恶化（n = 24）、无变化（n = 7）和病情改善（n = 62）。计算了NDI的最小可检测变化（MDC）。通过构建受试者工作特征曲线（ROC曲线）来区分病情改善或恶化的患者与无变化的患者，从而评估反应度。估计了最小临床重要差异（MCID）。结果 基线分数与重测NDI分数之间的重测信度非常好（ICC = 0.84；95% CI 0.72 - 0.91）。根据ROC曲线分析，NDI随时间区分病情改善和无变化患者的能力（反应度）是可接受的（AUC = 0.70；95% CI 0.58 - 0.82）。挪威版NDI的估计MDC为12.3%，MCID为16.6%。结论 挪威版NDI被证明是一种在专科门诊评估颈部疼痛患者颈部疼痛相关残疾方面具有良好重测信度和可接受反应度的工具。
