title: Heterogeneity in clinical presentations of posttraumatic stress disorder among medical patients: testing factor structure variation using factor mixture modeling.
abstract: 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.
authors.affiliation: Department of Psychology, University of Toledo.
authors.forename: Jon D
authors.initials: JD
authors.lastname: Elhai
authors.forename: James A
authors.initials: JA
authors.lastname: Naifeh
authors.forename: David
authors.initials: D
authors.lastname: Forbes
authors.forename: Kendra C
authors.initials: KC
authors.lastname: Ractliffe
authors.forename: Marijo
authors.initials: M
authors.lastname: Tamburrino
mesh_terms: D000328:Adult; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015146:Midwestern United States; D008960:Models, Psychological; D010361:Patients / Q000523:psychology*; D011594:Psychometrics; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis* / Q000503:physiopathology*; D011795:Surveys and Questionnaires / Q000592:standards; D014947:Wounds and Injuries / Q000523:psychology; D055815:Young Adult