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92. Differentiating between Traits and Dysfunction in Personality Assessment
The Alternative Model of Personality Disorder (AMPD) requires both traits and dysfunction to diagnose a personality disorder (PD). However, whether dysfunction significantly increments traits in the prediction of PD remains an open question and empirical findings are mixed. Given that the PID-5 is a self-report measure and the LPFS is intended for clinician use, it is also important to consider that non-overlap may be a function of these different sources, rather than a difference between traits and dysfunction per se. Therefore, the current study extends the literature by evaluating the incremental utility of both self- and clinician-reported dysfunction over both self- and clinician-reported traits in the prediction of PD among 220 current/recent psychiatric patients. To that end, a series of hierarchical regressions were conducted in which SCID-II PD criteria were regressed on the PID-5 traits (either self or clinician rated) in Block 1, followed by PID-5 traits and LPFS dysfunction (either self or clinician rated) in Block 2. Overall, results suggest that clinician-rated LPFS dysfunction, particularly in the Identity subdomain, significantly increments both self- and clinician-rated traits. Self-rated dysfunction, on the other hand, did not significantly increment either self- or clinician-rated traits in the prediction of personality pathology. Revisions to the AMPD that would improve its parsimony by maximizing the distinction between traits and dysfunction are suggested.