Psychometric performance of the ultra-short version of the post-traumatic growth inventory in Peruvian adults during the Post-Pandemic: Analysis from Item Response Theory and SEM models

Abstract

Objective: This study aimed to study the psychometric functioning of the ultra-short version of the Posttraumatic Growth Inventory through the Item Response Theory (IRT) and evaluate the Differential Item Functioning (DIF). Method: 404 Peruvian adults of both sexes (65.8% women and 34.2% men) between 18 and 58 years (M = 24.3, SD = 7.9) participated. The Brief Resilient Coping Scale and the General Well-being Index (WHO-5) were also applied. Results: All the items present adequate discrimination and difficulty indices. Also, it was found that item 1 presents DIF between the group of men and women. On the other hand, it was found that resilience significantly predicts posttraumatic growth (.50; p < .01) and, in turn, posttraumatic growth significantly predicts psychological well-being (.40; p < .01). Conclusions: The ultra-short version shows adequate psychometric functioning and is, therefore, a helpful tool that allows obtaining valid and reliable interpretations of posttraumatic growth.