Diagnosing personality disorders in recent-onset schizophrenia.

The present study aimed to determine the prevalence of personality disorders (PDs) and personality disorder traits in 40 recent-onset schizophrenic patients, to establish the degree of concordance between the Structured Interview for DSM-III Personality Disorders (SIDP) and the Million Multiaxial Clinical Inventory (MCMI-I), and to examine the interrater reliabilities for the diagnosis of SIDP disorders and traits. During their recovery phase, patients underwent the SIDP and completed the MCMI-I, a self-report inventory. Results showed that 57% of all patients had PDs according to the SIDP. The most common PDs were antisocial, borderline, and schizotypal, whereas the most common according to the MCMI-I were dependent, narcissistic, and avoidant. Both instruments indicated that multiple PD diagnoses were common. Paranoid and schizotypal traits were found to be ubiquitous across instruments. The level of agreements between the two instruments was poor on diagnostic assignment but better when trait scores were considered.