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In the initial subsample (<jats:italic>n<\/jats:italic> = 157), four clusters were identified, including a subgroup that scored consistently higher on measures\nof interpersonal violence and current physical problems. Similar results were found in the cross\u2010validation subsample (<jats:italic>n<\/jats:italic> = 156). These results provide support for the theoretical concept of malignant PTSD and suggest that veterans with chronic PTSD are not homogenous. Whereas some manifest extreme levels of both functional impairment and PTSD symptomatology, others exhibit markedly less functional impairment despite manifesting clinically significant levels of PTSD. Clinicians can consider this heterogeneity in their treatment decisions. \u00a9 2002 Wiley Periodicals, Inc. 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