title: Reliability and validity of the Korean version of the Impact of Event Scale-Revised.
abstract: OBJECTIVE
  The aim of this study was to explore the reliability and validity of the Impact of Event Scale-Revised Korean version (IES-R-K), a self-report scale for assessment of posttraumatic stress disorder (PTSD).
  
  
  METHODS
  The original Impact of Event Scale-Revised was translated into Korean, and the comparability of content was verified through back-translation procedures. This multicenter study included 93 patients with PTSD, 73 nonpsychotic psychiatric patients, and 88 healthy controls drawn from 18 hospitals across the country. The subjects were assessed using IES-R-K, Clinician-Administered PTSD Scale (CAPS), Beck Depression Inventory, and State Trait Anxiety Inventory (STAI; state anxiety subscale [STAI-S], trait anxiety subscale [STAI-T]) scales.
  
  
  RESULTS
  In the reliability test, Cronbach alpha coefficient and test-retest reliability were .93 and 0.91, respectively, indicating that the IES-R-K has good internal consistency. One-way analysis of variance revealed significant differences in IES-R-K scores among the patients with PTSD, nonpsychotic psychiatric patients, and healthy controls (F = 139.1, P < .001). Duncan post hoc test showed the significant differences among the 3 groups. To assess the validity of the IES-R-K, correlation coefficient between the IES-R-K and CAPS, STAI-S, and STAI-T was calculated. We found that there was a relatively high degree of correlation between the IES-R-K and CAPS (r = 0.92, P < .001). However, there was a relatively less degree of correlation between STAI-S and STAI-T and IES-R-K (r = 0.30, P < .001). Taken these together, IES-R-K showed good discriminant validity.
  
  
  CONCLUSIONS
  The IES-R-K showed good reliability and validity for the assessment of PTSD symptom severity. The IES-R-K is a useful instrument for assessing PTSD symptoms in Korea.
authors.affiliation: Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, South Korea.
authors.forename: Hyun-Kook
authors.initials: HK
authors.lastname: Lim
authors.forename: Jong-Min
authors.initials: JM
authors.lastname: Woo
authors.forename: Tae-Suk
authors.initials: TS
authors.lastname: Kim
authors.forename: Tae-Hyung
authors.initials: TH
authors.lastname: Kim
authors.forename: Kyeong-Sook
authors.initials: KS
authors.lastname: Choi
authors.forename: Sang-Keun
authors.initials: SK
authors.lastname: Chung
authors.forename: Ik-Seoung
authors.initials: IS
authors.lastname: Chee
authors.forename: Kyoung-Uk
authors.initials: KU
authors.lastname: Lee
authors.forename: Ki Chung
authors.initials: KC
authors.lastname: Paik
authors.forename: Ho-Jun
authors.initials: HJ
authors.lastname: Seo
authors.forename: Won
authors.initials: W
authors.lastname: Kim
authors.forename: Bora
authors.initials: B
authors.lastname: Jin
authors.forename: Jeong-Ho
authors.initials: JH
authors.lastname: Chae
mesh_terms: D000328:Adult; D044466:Asian People / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007723:Korea / Q000208:ethnology; D008016:Life Change Events; D008297:Male; D008875:Middle Aged; D019964:Mood Disorders / Q000175:diagnosis / Q000523:psychology; D010555:Personality Inventory / Q000706:statistics & numerical data*; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data; D011594:Psychometrics; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis* / Q000523:psychology; D011795:Surveys and Questionnaires; D014175:Translating