Prevalence of post-traumatic stress disorder in students 23 months after tsunami.

Objective: To study the prevalence of post-traumatic stress disorder (PTSD) in the 4th-9th grade students in an affected school 23 months after tsunami.

Method: Two-stage screening procedure was used in a diagnostic study designed to identify post-traumatic stress disorder in the 4th-9th grade students in a school in Takaupa district, Phang Nga province, 23 months after the 2004 tsunami. Impact of Events Scale (IES) was used as a screening questionnaire in the first stage.