A Tool to Analyze Delusions in a Nonclinical population: Peter’s Delusional Inventory (PDI-21)

The purpose of this study is to culturally adapt the Peter’s Delusional Inventory (PDI-21), originally developed by Peters, Joseph, and Garety (1999), for use in the Turkish context. A total of 674 participants participated in the data collection process. To provide a more culturally informed framework for the scale, an exploratory factor analysis (EFA) was conducted, resulting in the identification of 21 subscales. This scale structure underwent confirmatory factor analysis (CFA) to examine its six-component structure in a sample of university students. The results indicated that the 21-factor model demonstrated a satisfactory level of fit. To establish the criterion validity of Peter's Delusion Inventory, the EPQR-A scale, which is believed to assess similar constructs, was employed. The findings of the Pearson correlation analysis revealed a statistically significant positive association between the two measures (r=.35; p