Typologies of Posttraumatic Stress Disorder in the Bam Adult Population: 17 Years After Bam Earthquake

Abstract

Posttraumatic stress disorder (PTSD) is one of the most important issues after earthquakes. Following the Bam earthquake, much of the literature has documented the prevalence and correlates of PTSD, but no study has evaluated predominant typologies of PTSD in this population. The present study aims to investigate PTSD typologies among adults exposed to the Bam earthquake after 17 years. The data were collected 17 years after the 2003 Bam earthquake using multistage cluster sampling, in a historical cohort study. In total, 917 people participated in the study. Latent class analyses (LCA) were conducted to identify predominant typologies of PTSD symptoms and associated correlates. The LCA identified four meaningfully different classes that were characterized based on the PTSD items. The common profile was class 1 with 36.1% of the study population, which reported medium on “Re-experiencing” and “avoidance” items and high for “dysphoria” item. Also, the results showed significant differences for marital status, death relative, and age across the four classes of PTSD.

The results indicated after 17 years of the Bam earthquake, people who were exposed to this earthquake were divided into subgroups based on the severity and prevalence of PTSD symptoms. These findings highlighted the existence of experimental subgroups of PTSD symptoms following an earthquake, which can help us find those who are most in need of mental health services and also which can find specific interventions for any subgroups.