Psychometric Properties of Personality Inventory for ICD-11: Adaptation, Reliability, Validity, and Factorial Structure in an Iranian Sample

Introduction: The personality inventory for ICD-11 (PiCD-11) was developed in line with the introduction of the International Classification of Diseases (ICD-11). This study aimed to investigate adaptation, validity, reliability, and factor structure of the PiCD-11 in an Iranian sample. Material & Methods: Participants in this study were (67.6% female, 32.8% clinical sample) 417 students from state universities in Tehran. They were requested to complete the paper-based forms of the Personality Inventory for ICD-11 (PiCD-11), the Short form of Personality inventory fo DSM-5 (PID- 5-BF), as well as the Big Five Inventory (very brief for, BFI-10). Findings: Cronbach's alpha coefficient for five factors of the PiCD ranged from 0.73 (dissocial) to 0.82 (negative affectivity). The inventory domains also had a significant correlation (P=0.001) with PID-5-BF and BFI-10 scales. Exploratory and confirmatory factor analysis also confirmed the five-factor structure and optimal fit of the model related to the PiCD. Discussion & Conclusion: The 60-item inventory based on the International Classification of Diseases (PiCD-11) has good reliability and validity, and can be used for various clinical and research purposes in Iran for the Persian speaking population.