A confirmatory factor analysis of the impact of event scale using a sampleof World War II and Korean War veterans

This study assessed the factor structure of the Impact of Event Scale (IES) , a measure of intrusion and avoidance, using a sample of World War II and Korean War veterans who had experienced combat 40-50 years earlier. A serie s of 3 confirmatory factor analytic models were specified and estimated usi ng LISREL 8.3. Model 1 specified a 1-factor model. Model 2 specified a corr elated 2-factor model. Model 3 specified a 2-factor model with additional c ross-factor loadings for Items 2 and 12. Model 3 was found to fit the data. In addition, this model was found to be a better explanation of the data t han the other models. Also in addition, the correlations between the Intrus ion and Avoidance factors and the 4 subscales of the 28-item General Health Questionnaire were examined to determine the distinctiveness of the two IE S factors.