Personality subgroups in an inpatient Vietnam veteran treatment program.

Millon Clinical Multiaxial Inventory personality profiles of 250 male inpatient Vietnam veterans were examined to locate subgroups within that population. Using a hierarchical cluster analysis to form relatively homogeneous groups, four clusters were identified which accounted for 98% of the population. Three clusters had Millon profiles suggestive of a stress reaction and one cluster had a profile indicative of an antisocial adjustment. As measured by a PTSD subscale of the Minnesota Multiphasic Personality Inventory two clusters are high stress groups and two clusters are lower stress groups. The two Millon personality profiles in the high stress category were an 8-2-1/6 group and a 2-8-1-3 group. The lower stress groups had profiles of /8-2 and 6/8-5. The high stress groups are considered Posttraumatic Stress Disorder groups and the lower stress groups are considered nonPosttraumatic Stress Disorder groups.