Psychometric Properties of the Latvian LPFS-SR in Clinical and Nonclinical Samples

This study examines the psychometric properties of the Latvian adaptation of the Level of Personality Functioning Scale-Self Report (LPFS-SR) and its alignment with the Alternative DSM-5 Model for Personality Disorders (AMPD). A clinical sample (N = 142) and a nonclinical sample (N = 306) were formed. Internal consistency, factor structure, and criterion validity were assessed to evaluate the scale's psychometric properties. Confirmatory factor analysis compared five structural models: one-factor, two-factor, four-factor, higher order, and bifactor. The bifactor model demonstrated the best fit, capturing both general and subscale-specific variance in personality functioning. Correlation and regression analyses explored associations between the LPFS-SR and the Personality Inventory for DSM-5 (PID-5). The findings support the Latvian LPFS-SR as a valid and reliable tool for assessing personality functioning and are consistent with the principles of the AMPD.