Functional impairment and the DSM-5 dimensional system for personality disorder

Area of Science:

• Psychiatry
• Psychology
• Clinical Assessment

Background:

• The Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) introduced a dimensional approach to personality disorder for further research.
• This approach is operationalized through the Personality Inventory for DSM-5 (PID5).
• Functional impairment is a critical component in defining personality disorders, necessitating research into its relationship with extreme personality traits.

Purpose of the Study:

• To investigate the association between extreme personality trait variants measured by the PID5 and functional impairment.
• To assess the utility of the PID5 in evaluating personality disorder characteristics.

Main Methods:

• The study involved a sample of 989 college students and 91 clinical patients.
• The Personality Inventory for DSM-5 (PID5) was used to measure personality traits.
• Measures of functional impairment were administered to both samples.

Main Results:

• The PID5 facets demonstrated significant associations with functional impairment across both student and clinical samples.
• Clinical patients exhibited more pathological levels of most PID5 traits compared to college students.
• These findings suggest a robust link between personality trait extremes and functional impairment.

Conclusions:

• The PID5 is a valuable and useful measure for the DSM-5's new system of personality disorder diagnosis.
• The study validates the dimensional approach to personality disorder assessment.
• The PID5 effectively captures traits associated with functional impairment, aiding in diagnostic and research efforts.