Morbid Obesity Center, Vestfold Hospital Trust, Tønsberg, Norway.
Obes Facts. 2011;4(5):346-51. doi: 10.1159/000333406. Epub 2011 Oct 21.
The Medical Outcome Study 36-Item Short Form Health Survey (SF-36) is one of the most commonly applied generic quality of life instruments. The construct validity of the instrument in patients with morbid obesity is not established.
A total of 475 morbidly obese patients (68% women) with a mean (standard deviation) age of 44.7 (11.8) years, weight of 123.5 (24.1) kg and BMI of 41.7 (6.3) kg/m(2), who had been referred to a rehabilitation center, completed the SF-36 form. Exploratory factor analyses were performed to examine the underlying component structure of the questionnaire. Confirmatory factor analyses were performed to assess model fit.
The analysis suggested a 6-component structure rather than the 8-component structure used in the original SF-36. The first component consisted of items from the physical functioning subscale, the role physical subscale and the general health subscale, and explained 31% of the variance. The 6 components explained 61% of the total variance. The items loaded as expected in a physical and mental component. The assessment of model fit confirmed these findings.
The 2 summary scales of the SF-36 have satisfactory validity in patients with morbid obesity. However, the validity of the 8 subscales is questionable, and the subscales should be interpreted with care.
健康调查简表 36 项（SF-36）是最常应用的一般生活质量量表之一。该量表用于病态肥胖患者的结构有效性尚未建立。
共有 475 例病态肥胖患者（68%为女性），平均（标准差）年龄 44.7（11.8）岁，体重 123.5（24.1）kg，BMI 为 41.7（6.3）kg/m2，他们被转介到康复中心完成 SF-36 表。采用探索性因子分析来检验问卷的潜在结构。采用验证性因子分析来评估模型拟合度。
分析提示 6 个分量结构，而不是原始 SF-36 的 8 个分量结构。第一个分量由身体功能分量、身体角色分量和一般健康分量的项目组成，解释了 31%的方差。6 个分量解释了总方差的 61%。项目按预期加载到身体和心理分量。模型拟合评估证实了这些发现。
SF-36 的 2 个综合量表在病态肥胖患者中具有满意的有效性。然而，8 个分量的有效性值得怀疑，应谨慎解释分量。
