Kuptniratsaikul Vilai, Rattanachaiyanont Manee
Department of Rehabilitation Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Prannok Road, Bangkok 10700, Thailand.
Clin Rheumatol. 2007 Oct;26(10):1641-5. doi: 10.1007/s10067-007-0560-y. Epub 2007 Feb 20.
The aim of this study was to evaluate the psychometric properties (validity and reliability) of the Thai version of the Western Ontario and McMaster (WOMAC) index in knee osteoarthritis (OA) patients. After permission from the copyright holder of the WOMAC index was obtained, the questionnaire was translated into Thai, backtranslated, tested for face and content validities, and then modified. A convergent validity was evaluated in 114 patients with knee OA by comparing the scores of a modified Thai WOMAC index to those of the algofunctional Lequesne index. A test-retest reliability was evaluated in 89 patients who answered the modified Thai WOMAC index twice at 3-week intervals. The statistical analyses for the content validity were index of content validity (ICV), floor and ceiling effects, and skewness of distribution; for the convergent validity was Spearman's correlation; for the test-retest reliability were Spearman's correlation and intraclass correlation; and for the internal consistency was Chronbach's alpha. The Thai WOMAC index had face validity. The ICV of the content validity ranged from 0.25-1.00. Two items (F05 and F12 of the original 24-item WOMAC index) that had an ICV of 0 were removed from the modified Thai version. The modified 22-item Thai WOMAC index had convergent validity to the algofunctional Lequesne index in pain and function dimensions (Spearman's correlation coefficients were 0.66 and 0.69, respectively). The test-retest reliability had correlation coefficients ranging from 0.65 to 0.71. The internal consistency had an alpha ranging from 0.85 to 0.97. In conclusion, the modified Thai WOMAC index had acceptable psychometric properties for Thai patients with knee OA.
本研究旨在评估泰国版西安大略和麦克马斯特大学骨关节炎指数（WOMAC）在膝骨关节炎（OA）患者中的心理测量学特性（效度和信度）。获得WOMAC指数版权所有者的许可后，将问卷翻译成泰语，进行回译，测试表面效度和内容效度，然后进行修改。通过比较改良的泰国版WOMAC指数得分与algofunctional Lequesne指数得分，对114例膝OA患者进行了收敛效度评估。对89例患者进行了重测信度评估，这些患者每隔3周回答一次改良的泰国版WOMAC指数。内容效度的统计分析指标为内容效度指数（ICV）、地板效应和天花板效应以及分布偏度；收敛效度的统计分析指标为Spearman相关性；重测信度的统计分析指标为Spearman相关性和组内相关性；内部一致性的统计分析指标为Chronbach's alpha系数。泰国版WOMAC指数具有表面效度。内容效度的ICV范围为0.25-1.00。将ICV为0的两个项目（原始24项WOMAC指数中的F05和F12）从改良的泰国版中删除。改良的22项泰国版WOMAC指数在疼痛和功能维度上与algofunctional Lequesne指数具有收敛效度（Spearman相关系数分别为0.66和0.69）。重测信度的相关系数范围为0.65至0.71。内部一致性的alpha系数范围为0.85至0.97。总之，改良的泰国版WOMAC指数对于泰国膝OA患者具有可接受的心理测量学特性。
