Razmjou Helen, Stratford Paul, Holtby Richard
Holland Orthopaedic & Arthritic Centre, Sunnybrook Health Sciences Centre ; Department of Physical Therapy.
Physiother Can. 2012 Spring;64(2):135-44. doi: 10.3138/ptc.2010-51. Epub 2012 Apr 5.
The objective of this study was to develop and examine the measurement properties of a shortened version of the Western Ontario Rotator Cuff Index (WORC), the SHORTWORC, in individuals with rotator-cuff pathology.
The study occurred in two stages, both using secondary analysis of existing data sets. The first stage used cross-sectional data from candidates for rotator-cuff surgery to develop the SHORTWORC. The second stage examined various measurement properties of the SHORTWORC by analyzing scores from the WORC, the American Shoulder and Elbow Surgeons questionnaire, and the Constant-Murley score obtained from patients before and after rotator-cuff surgery. Approaches to validating the SHORTWORC included calculating the standard error of measurement (SEM) at an instant in time, performing a confirmatory factor analysis, correlating findings among the questionnaires, and examining differences between men and women. Sensitivity to change was investigated using standardized response mean and relative efficiency.
Data for 712 patients were used to develop the SHORTWORC, the final version of which consisted of 7 questions. Data for 166 patients (86 men, 80 women; mean age 57±11 years) were used for validation. The SEM based on internal consistency (SEMIC) was calculated as 7.43 SHORTWORC points. The SHORTWORC had similar convergent validity (r=0.72-0.82) and sensitivity to change (SRM=1.20 vs. 1.25, p>0.05) to the longer version. The relative efficiency of the SHORTWORC was 3.19 times that of the WORC (95% CI, 1.50-71.51) in discriminating men's from women's level of disability.
The SHORTWORC has indicators of validity, relative efficiency, and sensitivity to change comparable to those of the original version but has a smaller response burden.
The objective of this study was to develop and examine the measurement properties of a shortened version of the Western Ontario Rotator Cuff Index (WORC), the SHORTWORC, in individuals with rotator-cuff pathology. The study occurred in two stages, both using secondary analysis of existing data sets. The first stage used cross-sectional data from candidates for rotator-cuff surgery to develop the SHORTWORC. The second stage examined various measurement properties of the SHORTWORC by analyzing scores from the WORC, the American Shoulder and Elbow Surgeons questionnaire, and the Constant–Murley score obtained from patients before and after rotator-cuff surgery. Approaches to validating the SHORTWORC included calculating the standard error of measurement (SEM) at an instant in time, performing a confirmatory factor analysis, correlating findings among the questionnaires, and examining differences between men and women. Sensitivity to change was investigated using standardized response mean and relative efficiency. Data for 712 patients were used to develop the SHORTWORC, the final version of which consisted of 7 questions. Data for 166 patients (86 men, 80 women; mean age 57±11 years) were used for validation. The SEM based on internal consistency (SEM) was calculated as 7.43 SHORTWORC points. The SHORTWORC had similar convergent validity (=0.72−0.82) and sensitivity to change (SRM=1.20 vs. 1.25, >0.05) to the longer version. The relative efficiency of the SHORTWORC was 3.19 times that of the WORC (95% CI, 1.50–71.51) in discriminating men's from women's level of disability. The SHORTWORC has indicators of validity, relative efficiency, and sensitivity to change comparable to those of the original version but has a smaller response burden.
本研究的目的是开发并检验西安大略肩袖指数（WORC）的简化版SHORTWORC在肩袖病变患者中的测量特性。
本研究分两个阶段进行，均采用对现有数据集的二次分析。第一阶段使用肩袖手术候选者的横断面数据来开发SHORTWORC。第二阶段通过分析WORC、美国肩肘外科医师协会问卷的得分以及肩袖手术前后患者的Constant-Murley得分，检验SHORTWORC的各种测量特性。验证SHORTWORC的方法包括计算某一时刻的测量标准误差（SEM）、进行验证性因子分析、关联各问卷的结果以及检查男女之间的差异。使用标准化反应均值和相对效率来研究对变化的敏感性。
712例患者的数据用于开发SHORTWORC，其最终版本由7个问题组成。166例患者（86例男性，80例女性；平均年龄57±11岁）的数据用于验证。基于内部一致性计算的SEM（SEMIC）为7.43个SHORTWORC分数点。SHORTWORC与较长版本具有相似的收敛效度（r = 0.72 - 0.82）和对变化的敏感性（SRM = 1.20对1.25，p>0.05）。在区分男性和女性的残疾水平方面，SHORTWORC的相对效率是WORC的3.19倍（95%CI，1.50 - 71.51）。
SHORTWORC具有与原始版本相当的效度、相对效率和对变化的敏感性指标，但应答负担较小。
本研究的目的是开发并检验西安大略肩袖指数（WORC）的简化版SHORTWORC在肩袖病变患者中的测量特性。本研究分两个阶段进行，均采用对现有数据集的二次分析。第一阶段使用肩袖手术候选者的横断面数据来开发SHORTWORC。第二阶段通过分析WORC、美国肩肘外科医师协会问卷的得分以及肩袖手术前后患者的Constant-Murley得分，检验SHORTWORC的各种测量特性。验证SHORTWORC的方法包括计算某一时刻的测量标准误差（SEM）、进行验证性因子分析、关联各问卷的结果以及检查男女之间的差异。使用标准化反应均值和相对效率来研究对变化的敏感性。712例患者的数据用于开发SHORTWORC，其最终版本由7个问题组成。166例患者（86例男性，80例女性；平均年龄57±11岁）的数据用于验证。基于内部一致性计算的SEM为7.43个SHORTWORC分数点。SHORTWORC与较长版本具有相似的收敛效度（=0.72−0.82）和对变化的敏感性（SRM = 1.20对1.25，>0.05）。在区分男性和女性的残疾水平方面，SHORTWORC的相对效率是WORC的3.19倍（95%CI，1.50–71.51）。SHORTWORC具有与原始版本相当的效度、相对效率和对变化的敏感性指标，但应答负担较小。
