Validity of the DSM-5 Levels of Personality Functioning Scale-Self Report.

In this study we examined the structure, reliability, and validity of the Levels of Personality Functioning Scale-Self Report (LPFS-SR) in 3 large community samples. The LPFS-SR is a questionnaire with content that corresponds directly to the DSM-5 alternative model of personality disorders, Criterion A. We found that the LPFS-SR was highly reliable across a brief retest interval. LPFS-SR scores correlated substantially with a wide range of maladaptive personality traits, personality disorder constructs, and interpersonal problems. The LPFS-SR did not correlate as strongly with aspects of personality with less clear relations to distress and dysfunction. Data further support that identity, self-direction, intimacy, and empathy components of the LPFS-SR can be characterized by a single factor and have similar correlations with criterion variables, consistent with the hypothesis that DSM-5 Criterion A is a relatively homogeneous construct. Overall, these results support the validity of the LPFS-SR, highlight important issues in assessing personality pathology, and point toward novel avenues for research on personality disorder classification.