Material and Method: One thousand six hundred and twenty five surviving students from two schools in
Takuapa district, Phang-nga Province, were enrolled. Screening tests using Pediatric symptom checklists,
Childhood depressive intervention (CDI), and Revised child impact of events scales (CRIES) were done.
Psychiatric evaluations were done by child and adolescent psychiatrists. Post Traumatic Stress Disorder
(PTSD) was diagnosed using criteria from Diagnostic and Statistical Manual of Mental Disorders, 4th edition.
Results: The prevalence of PSTD in the affected students were 57.3, 46.1, 31.6, 10.4, and 7.6% at 6 weeks, 6