The Collaborative Longitudinal Personality Disorders Study: baseline Axis I/II and II/II diagnostic co-occurrence

Acta Psychiatr Scand. 2000 Oct;102(4):256-64. doi: 10.1034/j.1600-0447.2000.102004256.x.


Objective: To describe baseline diagnostic co-occurrence in the Collaborative Longitudinal Personality Disorders Study.

Method: Six hundred and sixty-eight patients were reliably assessed with diagnostic interviews for DSM-IV Axis I and II disorders to create five groups: Schizotypal (STPD), Borderline (BPD), Avoidant (AVPD), Obsessive-Compulsive (OCPD) and Major Depressive Disorder (MDD) without personality disorder (PD).

Results: Mean number of Axis I lifetime diagnoses was 3.4; STPD and BPD groups had more diagnoses than AVPD, OCPD, and MDD groups. Significant Axis I co-occurrences emerged for Social Phobia/ AVPD, PTSD/BPD and Substance Use/BPD. Mean number of co-occurring PDs was 1.4; STPD had more than BPD group which had more than AVPD and OCPD groups. Significant PD co-occurrence emerged for: STPD/ Paranoid and Schizoid PDs, BPD with Antisocial and Dependent PDs, and lower frequency for OCPD/Antisocial PD.

Conclusion: Diagnostic co-occurrences generally followed base rates, while significant departures resemble those of controlled literature.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Follow-Up Studies
  • Humans
  • Mental Disorders / complications*
  • Mental Disorders / diagnosis*
  • Personality Disorders / complications*
  • Personality Disorders / diagnosis*
  • Psychiatric Status Rating Scales*
  • Reproducibility of Results
  • Severity of Illness Index