Post traumatic reactions as individual differences: Latent structure analysis of the International Trauma Questionnaire in Italian Trauma-exposed and Non-Trauma exposed adults

To evaluate the internal consistency and factor structure of the Italian translation of the 12-item International Trauma Questionnaire (ITQ), 382 trauma-exposed and 366 non-trauma exposed Italian community-dwelling Italian adults from a total group of 748 volunteers completed the ITQ. The ITQ Post-traumatic Stress Disorder and Disorder of Self-Organization scales showed adequate Cronbach’s as in both trauma-exposed and non-trauma-exposed participants. Confirmatory factor analyses showed that the a priori model of item-to-scale assignment of the ITQ items was consistently reproduced in both trauma-exposed and non-trauma-exposed participants, even when measurement invariance was formally assessed. Finally, taxometric analyses showed that the latent distribution of the six ITQ PTSD symptom items should be conceived as a latent dimension rather than a categorical latent construct. As a whole, our findings supported to the cross-cultural validity of the ITQ while extending its clinical usefulness.