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Internalizing and externalizing classes in posttraumatic stress disorder: a latent class analysis.

David Forbes1, Jon D Elhai, Mark W Miller

  • 1Australian Centre for Posttraumatic Mental Health and Department of Psychiatry, University of Melbourne, Victoria, Australia. dforbes@unimelb.edu.au

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|June 22, 2010
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Summary
This summary is machine-generated.

This study identified four distinct personality profiles in veterans with posttraumatic stress disorder (PTSD) using latent class analysis (LCA). These profiles, based on internalizing and externalizing psychopathology, offer new insights into PTSD heterogeneity.

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Area of Science:

  • Psychiatry and Psychology
  • Veterans' Mental Health
  • Personality Disorders

Background:

  • Posttraumatic Stress Disorder (PTSD) is a significant mental health concern among combat veterans.
  • Understanding the heterogeneity of personality profiles within PTSD is crucial for targeted interventions.
  • Previous research has explored psychopathology dimensions but a clear typology for veterans with PTSD is needed.

Purpose of the Study:

  • To examine the typology of personality profiles in Australian combat veterans with PTSD.
  • To identify distinct latent classes based on internalizing and externalizing dimensions of psychopathology.
  • To validate the identified personality classes using external diagnostic measures.

Main Methods:

  • Latent Class Analysis (LCA) was applied to Minnesota Multiphasic Personality Inventory-2 (MMPI-2) Personality Psychopathology-5 (PSY-5) scale data.
  • Data were collected from 299 Australian combat veterans diagnosed with PTSD.
  • An optimal 4-class solution was identified and validated using external self-report and clinical interview diagnoses.

Main Results:

  • A 4-class solution emerged, including a PTSD externalizing class (aggressiveness, disconstraint), high and moderate internalizing classes (differing in introversion, negative emotionality, and psychoticism), and a simple PTSD class (normal range scores).
  • The externalizing class was characterized by high levels of aggressiveness and disconstraint.
  • Internalizing classes were differentiated by varying degrees of introversion, negative emotionality, and psychoticism.

Conclusions:

  • Latent class analysis successfully identified four distinct personality profiles among veterans with PTSD.
  • These findings highlight the complex interplay of internalizing and externalizing psychopathology in PTSD.
  • The identified typology provides a framework for understanding personality variations within PTSD and may inform treatment approaches.