Purc-Stephenson R J
Department of Social Sciences (Psychology).
Rehabil Psychol. 2014 Feb;59(1):10-18. doi: 10.1037/a0035353. Epub 2014 Jan 20.
The Posttraumatic Growth Inventory (PTGI) assesses positive changes after a traumatic or serious life crisis. However, there are differing views regarding its factor structure and little understanding if it captures the positive changes experienced among individuals diagnosed with a chronic disease. Using confirmatory factor analysis (CFA), the proposed five-factor structure and measurement invariance of the PTGI was examined using two chronic illness samples: arthritis and inflammatory bowel disease (IBD).
Individuals diagnosed with arthritis (n = 301) or IBD (n = 544) recruited from the community and the Internet completed the PTGI. Using a pooled sample, CFA tested five hypothesized models of the underlying factors structure of the PTGI. A stepwise procedure for testing the measurement invariance across the two groups evaluated the factor structure, factorial invariance, and latent mean invariance.
Using the pooled sample, the CFA supported the hypothesized five-factor model, revealing the PTGI is multidimensional. Multigroup CFA supported invariance of the PTGI across the two groups although there were significant differences in latent means.
The findings support that the PTGI assesses five related dimensions of PTG and that different chronic disease groups experience different types of positive changes. PTG may therefore be relevant as a meaningful treatment goal for people with chronic diseases as it is for people affected by other traumatic events.
创伤后成长问卷（PTGI）评估创伤或严重生活危机后的积极变化。然而，对于其因子结构存在不同观点，对于它是否能捕捉到慢性病患者经历的积极变化了解甚少。本研究使用验证性因子分析（CFA），通过两个慢性病样本（关节炎和炎症性肠病（IBD））来检验PTGI提议的五因子结构和测量不变性。
从社区和互联网招募的被诊断为关节炎（n = 301）或IBD（n = 544）的个体完成了PTGI。使用合并样本，CFA测试了PTGI潜在因子结构的五个假设模型。一个用于检验两组间测量不变性的逐步程序评估了因子结构、因子不变性和潜在均值不变性。
使用合并样本，CFA支持假设的五因子模型，表明PTGI是多维的。多组CFA支持PTGI在两组间的不变性，尽管潜在均值存在显著差异。
研究结果支持PTGI评估PTG的五个相关维度，且不同慢性病群体经历不同类型的积极变化。因此，PTG作为慢性病患者有意义的治疗目标可能与受其他创伤事件影响的人一样相关。
