Profile clusters of the MCMI-II personality disorder scales.

An analysis was conducted to identify the major personality disorder score profiles to be found in the Millon Clinical Multiaxial Inventory II. Application of Ward's agglomerative hierarchical procedure to two subsamples of psychiatric patients (n = 83 for each) yielded four replicated subgroups. A subsequent K-means nonhierarchical approach confirmed four of the Ward clusters. Three subgroups can be characterized as (a) Antisocial, Aggressive (Sadistic), and Passive-Aggressive; (b) Avoidant, Schizoid, and Self-Defeating, and (c) Schizoid, Dependent, and Compulsive. A fourth sizable group is comprised of patients with flat profiles.