Does avoidant personality disorder impact on the outcome of treatment for bulimia nervosa?

To examine the impact of avoidant personality disorder (AVPD) on bulimia nervosa (BN) treatment outcome over 3 years.

Women with BN were participating in a randomized treatment trial. The sample was split into: AVPD (n = 37), other PD (n = 37), and no PD (n = 60). Eating disorder symptomatology, depressive symptoms and psychosocial functioning were examined at pretreatment and follow-up. Multiple regression was conducted to control for high axis I comorbidity.

There were no significant differences across the groups at pretreatment or follow-up on eating disorder symptoms. AVPD had worse depressive symptoms and psychosocial functioning at pretreatment which continued 3 years post-treatment. Multiple regression analyses revealed that the presence of any lifetime mood disorder contributed to these significant results.

These findings suggest AVPD is not a significant predictor of BN outcome. However, AVPD is associated with poorer psychiatric symptoms although much of this variance appears to be attributable to the lifetime presence of any mood disorder.