The relevance of personality traits to the study of psychopathology has long been recognized, particu- larly in terms of understanding patterns of comorbidity. In fact, a multidimensional personality trait model reflecting five higher-order personality dimensions—negative affect, detachment, antagonism, disinhibition, and psychoticism— is included in the fifth edition of the Diagnostic and Statis- tical Manual of Mental Disorders (DSM-5) and represented in the Personality Inventory for DSM-5 (PID-5). However, evaluation of these dimensions and underlying personality facets within clinical samples has been limited. In the pre- sent study, we utilized the PID-5 to evaluate the personality profile elevation and composition of 150 control veterans and 35 veterans diagnosed with posttraumatic stress dis- order (PTSD). Results indicated that veterans with PTSDendorsed significantly more personality pathology than control veterans, with scores on detachment and psychoti- cism domains most clearly discriminating between the two groups. When personality domain scores were considered as parts of each subject’s personality profile, a slightly dif- ferent picture emerged. Specifically, the PTSD composition was primarily characterized by detachment and negative affect, followed by disinhibition, psychoticism, and antago- nism in that order of relative importance. The profile of the control group was significantly different, mostly accounted for differences in antagonism and psychoticism. Using these complementary analytic strategies, the findings dem- onstrate the relevance of personality pathology to PTSD, highlight internalizing features of PTSD, and pave the way for future research aimed at evaluating the role of shared maladaptive personality traits in underlying the comorbid- ity of PTSD and related disorders.
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