ArticleRELIABILIGY AND VALIDITY OF THE JAPANESE-LANGUAGE VERSION OF THE IMPACT OF EVENT SCALE-REVISED (IES-R-J): FOUR STUDIES OF DIFFERENT TRAUMATIC EVENTSASUKAI, NOZOMU M.D.1; KATO, HIROSHI M.D.2; KAWAMURA, NORIYUKI M.D.3; KIM, YOSHIHARU M.D.3; YAMAMOTO, KOHEI M.A.4; KISHIMOTO, JUNJI M.A.5; MIYAKE, YUKO PH.D.1,3; NISHIZONO-MAHER, AYA M.D.1Author Information 1Department of Stress Disorders Research, Tokyo Institute of Psychiatry, 2-1-8 Kamikitazawa, Setagaya, Tokyo 156-8585, Japan. Send reprint requests to Dr. Asukai. 2 Hyogo Institute for Mental Health Care, Kobe, Japan. 3 National Institute of Mental Health, Ichikawa, Japan. 4 Wakayama City Public Health Center, Wakayama, Japan. 5 SAS Institute Japan, Tokyo, Japan. This research was supported by a grant from Japan’s Ministry of Health and Welfare for mental and nervous diseases. The authors are grateful to all staffers who participated in our studies for their assistance in completing data collection. The Journal of Nervous and Mental Disease: March 2002 - Volume 190 - Issue 3 - p 175-182 Buy Abstract The authors developed the Japanese-language version of the Impact of Event Scale-Revised (IES-R-J) and investigated its reliability and validity in four different groups: workers with lifetime mixed traumatic events, survivors of an arsenic poisoning case, survivors of the Hanshin-Awaji earthquake, and survivors of the Tokyo Metro sarin attack. Evidence includes retest reliability and internal consistency of the IES-R-J. Posttraumatic stress disorder (PTSD) and partial PTSD cases indicated significantly higher scores than non-PTSD cases. The IES-R-J can be a useful self-rating diagnostic instrument particularly for survivors with PTSD symptoms as a clinical concern (PTSD + partial PTSD) by using a 24/25 cutoff in total score. In analysis of scale structure, the majority of intrusion and hyperarousal items were subsumed under the same cluster, whereas avoidance items made up a separate cluster. Female patients indicated higher scores than male patients. A negative weak correlation between age and the score was found only among female earthquake survivors. The IES-R-J can be used as a validated instrument in future international comparative research. © 2002 Lippincott Williams & Wilkins, Inc.