Department of Psychology, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606-3390, United States.
J Anxiety Disord. 2012 Apr;26(3):480-5. doi: 10.1016/j.janxdis.2012.01.008. Epub 2012 Feb 4.
This study examined differences in posttraumatic stress disorder's (PTSD) factor structure between veterans with and without a PTSD diagnosis. An archival dataset of 378 trauma-exposed Canadian veterans (mostly men) was used. The sample was divided into participants who met DSM-IV criteria for PTSD (n=230) and those who did not (n=148), based on a structured diagnostic interview. Confirmatory factor analysis was conducted to determine which empirically supported four-factor PTSD model best fit the data: (1) King, Leskin, King, and Weathers' (1998) Emotional Numbing model of Reexperiencing, Avoidance, Emotional Numbing and Hyperarousal factors, or (2) Simms, Watson, and Doebbeling's (2002) Dysphoria model of Reexperiencing, Avoidance, Dysphoria, and Hyperarousal factors. Results indicated that both models fit slightly better in the No-PTSD group. A series of measurement invariance tests demonstrated that the two groups varied on all parameters with the exception of factor loadings. The PTSD-group had larger intercepts, factor means, and residual error variance, suggesting that these participants had greater PTSD severity but more measurement error associated with their PTSD ratings. This study contributes to our understanding of how a PTSD diagnosis impacts the structure of PTSD symptoms at the latent level.
本研究考察了创伤后应激障碍（PTSD）在有和没有 PTSD 诊断的退伍军人之间的因子结构差异。使用了一个包含 378 名创伤后暴露的加拿大退伍军人（主要是男性）的档案数据集。根据结构化诊断访谈，将样本分为符合 DSM-IV PTSD 标准的参与者（n=230）和不符合标准的参与者（n=148）。进行验证性因子分析，以确定哪种经验支持的 PTSD 四因子模型最适合数据：（1）King、Leskin、King 和 Weathers（1998）的再体验、回避、情感麻木和过度警觉因素的情感麻木模型，或（2）Simms、Watson 和 Doebbeling（2002）的再体验、回避、烦躁和过度警觉因素的烦躁模型。结果表明，这两种模型在无 PTSD 组中都有稍微更好的拟合度。一系列测量不变性测试表明，两组在所有参数上都存在差异，除了因子负荷。PTSD 组的截距、因子均值和残差方差更大，这表明这些参与者的 PTSD 严重程度更大，但与 PTSD 评分相关的测量误差更大。这项研究有助于我们理解 PTSD 诊断如何在潜在水平上影响 PTSD 症状的结构。
