J Korean Neuropsychiatr Assoc.  1999 May;38(3):501-513.

A Study of Reliability and Validity on the Korean Version of Impact of Event Scale

  • 1Department of Neuropsychiatry, Presbyterian Medical Center, Chonju, Korea.


In order to develop a self-report scale measureing posttraumatic distress, the authors translated Horowitz's(1979) Impact of Event Scale(IES) in Korean and explored its reliability and validity. The IES, BDI, STAI-I, II and MMPI-PTSD were administered to 143 college students and 104 patients who had experienced auto vehicle accident. The internal consistency(item-total correlation, students: r=.52, patients: r=.58:Cronbach's alpha, students: alpha=.87, patients: alpha=.89) and test-retest reliability (r=.73) were psychometrically approvable. To examine the validity, patients who were classified PTSD and non-PTSD were compared with IES, BDI, STAI-I, II and MMPI-PTSD. There were significant group differences in IES, BDI, and MMPI-PTSD. The IES was significantly correlated with BDI, STAI-II, and MMPI-PTSD. It was more highly correlated with MMPI-PTSD than BDI or STAI. The results of factor analysis suggested a single factor. IES showed sufficient discriminant validities between PTSD and non-PTSD(74.4%). Finally, the usefulness of the scale, some limitations, and implications for future study were discussed.


Impact of event scale; Posttraumatic stress disorder; Reliability; Validity
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