Data analysis
The prevalence of PTSD and depression and their risk factors were calculated and analyzed. The authors used descriptive statistics to summarize the demographic data and traumatic experiences. Logistic regression analysis backward stepwise, adjusted for confounding variables, was used to identify independent risk factors for PTSD and depression. A p-value of .05 was considered as significant. Odd ratio (OR) with 95% confidence interval (CI) were calculated. Risk factors for PTSD and depression included sex, age, education, religious, and tsunami-specific traumatic experiences (13 items) were entered in regression model.