Personality disorder not otherwise specified: searching for an empirically based diagnostic threshold

Area of Science:

• Psychiatry
• Clinical Psychology
• Psychometrics

Background:

• Personality disorders (PDs) are complex mental health conditions.
• Diagnostic criteria for PDNOS require empirical investigation for improved accuracy.
• Existing diagnostic frameworks may not fully capture the spectrum of personality pathology.

Purpose of the Study:

• To propose and validate a method for empirically investigating diagnostic criteria for PDNOS.
• To establish an evidence-based diagnostic threshold for PDNOS.
• To assess the prevalence of PDNOS in a young adult sample.

Main Methods:

• Utilized data from 572 military recruits and undergraduate students screened for PDs.
• Employed the Structured Interview for DSM-IV Personality.
• Applied classification and regression tree modeling to predict PD diagnosis based on trait patterns.

Main Results:

• Subjective distress increased and social/occupational functioning decreased with more PD criteria met.
• An empirically derived threshold of 10 PD criteria was identified for PDNOS diagnosis.
• This threshold identified PDNOS in 5.5% of the interviewed young adults.

Conclusions:

• The proposed method provides an empirical basis for diagnosing PDNOS.
• A threshold of 10 PD criteria appears appropriate for identifying PDNOS in this population.
• Further research can refine diagnostic thresholds and improve the assessment of personality disorders.