Panom KetumarnNantawat SitdhiraksaNatthorn PithayaratsathienVinadda PiyasilpaRattanothai PlubrukanHattaya DumrongpholSarinee RungsriSirina SatthapisitChanvit PornnoppadolSucheera PhattharayuttawatMahidol UniversityQueen Sirikit National Institute of Child HealthKing Chulalongkorn Memorial Hospital, Faculty of Medicine Chulalongkorn UniversityKhon Kaen Regional HospitalPhranakhon Sri Ayutthaya Hospital2018-09-132018-09-132009-12-01Asian Journal of Psychiatry. Vol.2, No.4 (2009), 144-148187620182-s2.0-70849129740https://repository.li.mahidol.ac.th/handle/123456789/27857Objective: 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. In the second stage, the students were assessed by a psychiatrist to identify PTSD according to DSM-IV criteria. SPSS 10.0, inferential statistics and Chi-square test were used to analyze the data. Result: A total of 436 students participated in the study. Forty of them were diagnosed with PTSD. The prevalence of PTSD was 15.1%. The sensitivity, specificity and negative predictive value of IES were 0.75, 0.54 and 0.92 respectively. Conclusion: The prevalence of PTSD in students in a school 23 months after tsunami was 15.1%. © 2009 Elsevier B.V. All rights reserved.Mahidol UniversityMedicinePsychologyArticleSCOPUS10.1016/j.ajp.2009.10.005