Personality disorders were prevalent in ~35% of the pooled sample from studies on adults with OCD. While this rate was lower than mood disorders (54%), it was similar to anxiety disorders (32%). OCPD was the most common personality disorder (17%), followed by anxious-avoidant personality disorder (AAPD) (9%), and borderline personality disorder (BPD) (9%). Given these high comorbidity rates, it is noteworthy that <15% studies on adult OCD reported personality disorders. An earlier meta-analysis reported OCD to have a higher probability of comorbid personality disorders, in comparison to anxiety disorders (99). A report from the Nepean OCD study suggested that comorbid OCPD is associated with prominent symptoms, intense co-occurring psychopathology, and greater distress (100). In another systematic examination of clinical correlates of comorbid personality disorders in OCD, phenomenological and mood disorder comorbidity related differences were reported across OCPD, BPD, and AAPD (101).
