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Heterogeneity in clinical presentations of posttraumatic stress disorder among medical patients: Testing factor structure variation using factor mixture modeling
Author(s) -
Elhai Jon D.,
Naifeh James A.,
Forbes David,
Ractliffe Kendra C.,
Tamburrino Marijo
Publication year - 2011
Publication title -
journal of traumatic stress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.259
H-Index - 134
eISSN - 1573-6598
pISSN - 0894-9867
DOI - 10.1002/jts.20653
Subject(s) - confirmatory factor analysis , dysphoria , psychology , latent class model , rumination , clinical psychology , structural equation modeling , anxiety , psychiatry , statistics , cognition , mathematics
The present study used factor mixture modeling to explore empirically defined subgroups of psychological trauma victims based on confirmatory factor analysis (CFA) and latent class analysis of posttraumatic stress disorder (PTSD) symptoms. We sampled 310 medical patients with a history of trauma exposure. Confirmatory factor analysis revealed that the 4‐factor emotional numbing PTSD model yielded the best model fit. Using latent factor means derived from this model and the 4‐factor dysphoria PTSD model (indexing severity on PTSD factors), 3 latent classes of participants were identified using factor mixture modeling. The 3‐class model fit the data very well and was validated against external measures of anxiety and rumination.