Department of Occupational Therapy, College of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan.
School of Occupational Therapy, College of Medicine, National Taiwan University, Taipei City, Taiwan.
PLoS One. 2017 Dec 6;12(12):e0188478. doi: 10.1371/journal.pone.0188478. eCollection 2017.
No studies have compared the 2-factor structures of Wong's and Post's versions of the short-form Stroke-Specific Quality of Life (i.e., 12-item SSQOL) scale. This study compared the construct validity of 2 short-forms of the 12-item-SSQOL (not the 12-domain-SSQOL).
Data were obtained from a previous validation study of the original 49-item SSQOL in 263 patients. Construct validity was tested by confirmatory factor analysis (CFA) to examine whether the two-factor structure, including psychosocial and physical domains, was supported in both versions. The CFA tested the data-model fit by indices: chi-square χ2/df ratio, root mean square error of approximation (RMSEA), comparative fit index (CFI), nonnormative fit index (NNFI), standard root mean square residual (SRMR), and parsimony normed fit index (PNFI). Item factor loadings (cutoffs: .50) were examined. Model fit was compared using Akaike information criterion (AIC) and consistent AIC (i.e., CAIC) values.
All model fit indices for Post's version fell within expected ranges: χ2/df ratio = 2.02, RMSEA = 0.05, CFI = 0.97, NNFI = 0.97, SRMR = 0.06, and PNFI = 0.76. In the psychosocial domain, the item factor loadings ranged from 0.46 to 0.63. In the physical domain, all items (except the language and vision items) had acceptable factor loadings (0.68 to 0.88). However, in Wong's version, none of the model indices met the criteria for good fit. In model fit comparisons, Post's version had smaller AIC and CAIC values than did Wong's version.
All fit indices supported Post's version, but not Wong's version. The construct validity of Post's version with a 2-factor structure was confirmed, and this version of the 12-item SSQOL is recommended.
目前还没有研究比较 Wong 版和 Post 版简化型 Stroke-Specific Quality of Life（即 12 项 SSQOL 量表）的两因素结构。本研究比较了两种 12 项 SSQOL 简化版（而非 12 项 SSQOL 量表）的结构效度。
数据来自先前对 49 项 SSQOL 原始量表在 263 名患者中的验证研究。结构效度通过验证性因子分析（CFA）进行检验，以确定两种版本是否均支持心理社会和身体两个因素结构。CFA 通过以下指标检验数据模型拟合度：卡方自由度比（χ2/df）、近似均方根误差（RMSEA）、比较拟合指数（CFI）、非规范拟合指数（NNFI）、标准均方根残差（SRMR）和简约规范拟合指数（PNFI）。还检查了项目因子负荷（标准：0.50）。通过比较赤池信息量准则（AIC）和一致 AIC（即 CAIC）值来比较模型拟合度。
Post 版的所有模型拟合指数均在预期范围内：χ2/df 比值=2.02，RMSEA=0.05，CFI=0.97，NNFI=0.97，SRMR=0.06，PNFI=0.76。在心理社会领域，项目因子负荷范围为 0.46 至 0.63。在身体领域，除语言和视觉项目外，所有项目（0.68 至 0.88）的因子负荷均在可接受范围内。然而，在 Wong 版中，没有一个模型指数符合良好拟合的标准。在模型拟合度比较中，Post 版的 AIC 和 CAIC 值均小于 Wong 版。
所有拟合指数均支持 Post 版，而不支持 Wong 版。Post 版具有两因素结构的结构效度得到了确认，推荐使用该版 12 项 SSQOL 量表。
