The objective of this study was to assess the distinctiveness, Incremental
validity, and gender bias of self-defeating personality disorder (SDPD) sym
ptoms, A total of 441 nonclinical subjects completed personality disorder q
uestionnaires. Structural equation modeling and regression analyses indicat
ed that SDPD symptoms were distinctive, predicted impairment/distress beyon
d other personality disorder symptoms, and showed no gender bias. SDPD warr
ants reconsideration as a valid nosological category.