PATTERNS OF LIFETIME PTSD COMORBIDITY: A LATENT CLASS ANALYSIS
Article first published online: 28 DEC 2012
© 2012 Wiley Periodicals, Inc.
Depression and Anxiety
Volume 30, Issue 5, pages 489–496, May 2013
How to Cite
Galatzer-Levy, I. R., Nickerson, A., Litz, B. T. and Marmar, C. R. (2013), PATTERNS OF LIFETIME PTSD COMORBIDITY: A LATENT CLASS ANALYSIS. Depress. Anxiety, 30: 489–496. doi: 10.1002/da.22048
- Issue published online: 25 APR 2013
- Article first published online: 28 DEC 2012
- Manuscript Accepted: 2 DEC 2012
- Manuscript Revised: 1 NOV 2012
- Manuscript Received: 10 AUG 2012
Posttraumatic stress disorder (PTSD) is associated with high rates of psychiatric comorbidity, most notably substance use disorders, major depression, and other anxiety disorders. However, little is known about how these disorders cluster together among people with PTSD, if disorder clusters have distinct etiologies in terms of trauma type, and if they confer greater burden over and above PTSD alone.
Utilizing Latent Class Analysis, we tested for discrete patterns of lifetime comorbidity with PTSD following trauma exposure (n = 409). Diagnoses were based on the Structured Clinical Interview for DSM-IV (SCID). Next, we examined if gender, trauma type, symptom frequency, severity, and interference with everyday life were associated with the latent classes.
Three patterns of lifetime comorbidity with PTSD emerged: a class characterized by predominantly comorbid mood and anxiety disorders; a class characterized by predominantly comorbid mood, anxiety, and substance dependence; and a relatively pure low-comorbidity PTSD class. Individuals in both high comorbid classes had nearly two and a half times the rates of suicidal ideation, endorsed more PTSD symptom severity, and demonstrated a greater likelihood of intimate partner abuse compared to the low comorbidity class. Men were most likely to fall into the substance dependent class.
PTSD comorbidity clusters into a small number of common patterns. These patterns may represent an important area of study, as they confer distinct differences in risk and possibly etiology. Implications for research and treatment are discussed.