The impact of avoidant personality disorder on psychosocial impairment is substantial.

Few studies have compared the psychosocial problems associated with different types of personality disorders (PDs). The aim of this study was to investigate the functional impairment and symptomatic distress associated with six PD diagnoses coded in DSM-IV: paranoid, borderline, avoidant, dependent, obsessive-compulsive PD and PD not otherwise specified, as well as a condition of non-psychotic symptom disorders with no PD. The study included 1023 patients from eight day treatment units specialized in the treatment of PDs. Eighty-one per cent had one or more PD diagnoses. At admission to day treatment, the patients were evaluated with respect to global functioning, symptomatic and interpersonal distress, education, quality of life, social support, legal problems and previous psychotic episodes and psychiatric hospitalizations. There were few differences in global functioning or symptomatic and interpersonal distress between patients with a single PD diagnosis. Avoidant PD and borderline PD was the diagnoses that contributed most to dysfunction in most variables when taking into account the presences of several co-occurrent PD diagnoses and axis I disorders. The psychosocial problems associated with avoidant and borderline PD were partly domain specific. The study indicates that avoidant PD is associated with severe dysfunction and subjective distress, at a level comparable to that of borderline PD. Avoidant PD deserves more attention, both with respect to the specific psychopathology and dynamics underlying the disorder and the development of treatment approaches.