title: Factor structure of the Impact of Event Scale-Revised in two different Peruvian samples.
abstract: BACKGROUND
  This article studied the factor structure of the Impact of Event Scale-Revised (IES-R) in two samples in Peru, i.e., a sample of survivors of a fire (N=174) and a university student sample (N=562).
  
  
  METHODS
  First, confirmatory factor analysis was used to compare nine different models of posttraumatic stress disorder symptoms as evaluated by the IES-R in both of the samples separately. The model with the best fit in both samples had four correlated factors, i.e., Intrusion, Avoidance, Hyperarousal and Sleep Disturbance. Second, the degree of factorial invariance of the IES-R was compared in both the samples using multiple group confirmatory factor analysis.
  
  
  CONCLUSIONS
  The results showed almost no differences between both samples. Finally, the results supported the internal consistency, as well as the concurrent and convergent validity of the IES-R in Peru.
authors.affiliation: Research Group for Psychotherapy and Psychodynamic Psychology, Department of Psychology, Katholieke Universiteit Leuven, Leuven, Belgium. rafael.gargurevich@psy.kuleuven.be
authors.forename: Rafael
authors.initials: R
authors.lastname: Gargurevich
authors.forename: Patrick
authors.initials: P
authors.lastname: Luyten
authors.forename: Jean-Francois
authors.initials: JF
authors.lastname: Fils
authors.forename: Jozef
authors.initials: J
authors.lastname: Corveleyn
mesh_terms: D000293:Adolescent; D000328:Adult; D003431:Cross-Cultural Comparison; D039721:Diagnostic and Statistical Manual of Mental Disorders; D004522:Educational Status; D005107:Explosions; D005163:Factor Analysis, Statistical; D005260:Female; D005390:Fires; D006801:Humans; D008016:Life Change Events; D008297:Male; D010555:Personality Inventory / Q000706:statistics & numerical data*; D010568:Peru; D011203:Poverty / Q000523:psychology; D011594:Psychometrics / Q000706:statistics & numerical data; D012016:Reference Values; D015203:Reproducibility of Results; D012944:Social Support; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis* / Q000208:ethnology / Q000523:psychology; D017741:Survivors / Q000523:psychology*; D014175:Translating; D055815:Young Adult