Ramos Catarina, Leal Isabel, Marôco Ana Lúcia, Tedeschi Richard G
ISPA - University Institute(Portugal).
University of North Carolina at Charlotte(USA).
Span J Psychol. 2016 Oct 3;19:E64. doi: 10.1017/sjp.2016.65.
The Posttraumatic Growth Inventory (PTGI) is frequently used to assess positive changes following a traumatic event. The aim of the study is to examine the factor structure and the latent mean invariance of PTGI. A sample of 205 (M age = 54.3, SD = 10.1) women diagnosed with breast cancer and 456 (M age = 34.9, SD = 12.5) adults who had experienced a range of adverse life events were recruited to complete the PTGI and a socio-demographic questionnaire. We use Confirmatory Factor Analysis (CFA) to test the factor-structure and multi-sample CFA to examine the invariance of the PTGI between the two groups. The goodness of fit for the five-factor model is satisfactory for breast cancer sample (χ2(175) = 396.265; CFI = .884; NIF = .813; RMSEA [90% CI] = .079 [.068, .089]), and good for non-clinical sample (χ2(172) = 574.329; CFI = .931; NIF = .905; RMSEA [90% CI] = .072 [.065, .078]). The results of multi-sample CFA show that the model fit indices of the unconstrained model are equal but the model that uses constrained factor loadings is not invariant across groups. The findings provide support for the original five-factor structure and for the multidimensional nature of posttraumatic growth (PTG). Regarding invariance between both samples, the factor structure of PTGI and other parameters (i.e., factor loadings, variances, and co-variances) are not invariant across the sample of breast cancer patients and the non-clinical sample.
创伤后成长量表（PTGI）常被用于评估创伤事件后的积极变化。本研究旨在检验PTGI的因子结构和潜在均值不变性。招募了205名被诊断为乳腺癌的女性（年龄均值M = 54.3，标准差SD = 10.1）和456名经历过一系列不良生活事件的成年人（年龄均值M = 34.9，标准差SD = 12.5），让他们完成PTGI和一份社会人口学调查问卷。我们使用验证性因子分析（CFA）来检验因子结构，并使用多样本CFA来检验两组之间PTGI的不变性。五因子模型对乳腺癌样本的拟合优度令人满意（χ2(175) = 396.265；CFI = 0.884；NIF = 0.813；RMSEA [90%置信区间] = 0.079 [0.068, 0.089]），对非临床样本的拟合优度良好（χ2(172) = 574.329；CFI = 0.931；NIF = 0.905；RMSEA [90%置信区间] = 0.072 [0.065, 0.078]）。多样本CFA的结果表明，无约束模型的模型拟合指数相等，但使用约束因子载荷的模型在组间并非不变。这些发现为原始的五因子结构以及创伤后成长（PTG）的多维性质提供了支持。关于两个样本之间的不变性，PTGI的因子结构和其他参数（即因子载荷、方差和协方差）在乳腺癌患者样本和非临床样本之间并非不变。
