Personality characteristics of drug addicts and alcoholics on the Millon Clinical Multiaxial Inventory.

The Million Clinical Multiaxial Inventory (MCMI) was administered to 106 alcoholics and 100 addicts in separate VA inpatient rehabilitation treatment programs. The alcoholics scored higher on the personality style scales of Avoidant, Passive-Aggressive, Schizotypal, Borderline and Paranoid, while the opiate addicts scored higher on the Narcissistic personality disorder scale. Separate cluster analyses for both groups further revealed common personality styles among both groups. Several MCMI scales showed significant correlations with age, but in no case were the effects attributed to age larger than 5% of the total variance. The MCMI may alert clinicians to subtle similarities and differences between and among alcoholics and opiate addicts.