Eubank Breda H, Mohtadi Nicholas G, Lafave Mark R, Wiley J Preston, Emery J C Herbert
Department of Health and Physical Education, Faculty of Health, Community, and Education, Mount Royal University, Calgary, AB, Canada.
Sport Medicine Centre, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.
J Shoulder Elbow Surg. 2017 Feb;26(2):314-322. doi: 10.1016/j.jse.2016.07.030. Epub 2016 Oct 7.
The Rotator Cuff Quality of Life Index (RC-QOL) was developed to evaluate quality of life in patients with rotator cuff disorders (RCD). The purpose of this study was to provide additional reliability, validity, and responsiveness testing in accordance with the Consensus-Based Standards for the Selection of Health Measurement Instruments (COSMIN) guidelines.
Preliminary patient interviews included 15 patients. Seventy patients (mean age, 58; standard deviation, 9 years) with RCD were evaluated. Methodology testing included internal consistency, test-retest reliability, measurement error, content validity, and construct validity. Responsiveness, interpretability, and generalizability were also analyzed.
The Cronbach α was 0.96 (95% confidence interval, 0.89-0.99; range, 0.72-0.94). The intraclass correlation coefficient for the RC-QOL was 0.87 (95% confidence interval, 0.79-0.85; range, 0.77-0.88). The standard error of measurement was 8 (range, 7-13). The smallest detectable change was 3 (range, 2-4). Content validity was confirmed through standardized patient interviews. All a priori hypotheses were confirmed. No floor or ceiling effects were present. The minimally clinical important difference ranged between 7 and 14 points. The study met the COSMIN criteria for interpretability and generalizability.
The RC-QOL is a reliable and valid measure of health-related quality of life in patients with chronic RCD. The results of this study added to the methodologic quality assessment of the RC-QOL, completing 7 of 10 COSMIN criteria.
肩袖生活质量指数（RC-QOL）旨在评估肩袖疾病（RCD）患者的生活质量。本研究的目的是依据基于共识的健康测量工具选择标准（COSMIN）指南，提供额外的信度、效度和反应度测试。
初步患者访谈纳入了15名患者。对70例RCD患者（平均年龄58岁；标准差9岁）进行了评估。方法学测试包括内部一致性、重测信度、测量误差、内容效度和结构效度。还分析了反应度、可解释性和可推广性。
Cronbach α为0.96（95%置信区间，0.89 - 0.99；范围，0.72 - 0.94）。RC-QOL的组内相关系数为0.87（95%置信区间，0.79 - 0.85；范围，0.77 - 0.88）。测量标准误为8（范围，7 - 13）。最小可检测变化为3（范围，2 - 4）。通过标准化患者访谈确认了内容效度。所有先验假设均得到证实。不存在地板效应或天花板效应。最小临床重要差异在7至14分之间。该研究符合COSMIN关于可解释性和可推广性的标准。
RC-QOL是慢性RCD患者健康相关生活质量的可靠且有效的测量工具。本研究结果补充了RC-QOL的方法学质量评估，完成了10项COSMIN标准中的7项。
