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  • Title: A confirmatory factor analysis of the Impact of Event Scale using a sample of World War II and Korean War veterans.
    Author: Shevlin M, Hunt N, Robbins I.
    Journal: Psychol Assess; 2000 Dec; 12(4):414-7. PubMed ID: 11147109.
    Abstract:
    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 series of 3 confirmatory factor analytic models were specified and estimated using LISREL 8.3. Model 1 specified a 1-factor model. Model 2 specified a correlated 2-factor model. Model 3 specified a 2-factor model with additional cross-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 than the other models. Also in addition, the correlations between the Intrusion and Avoidance factors and the 4 subscales of the 28-item General Health Questionnaire were examined to determine the distinctiveness of the two IES factors.
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