Increased personality disorders and Axis I comorbidity in atypical depression.

OBJECTIVE Comparison of patients with and without atypical depression on comorbid Axis I and I disorders to determine whether atypical depression is associated with a higher comorbidity. METHOD Twenty-nine major depressive disorder patients with and without atypical depression were compared on clinical measures using multiple regression analyses. RESULTS Atypical depression predicted the presence of comorbid Axis I (100% vs 33%), Axis II (90% vs 35%), and both Axis I and II (65% vs 8.14%) disorders. Personality disorders did not mediate the relationship between atypical depression and Axis I comorbidity. CONCLUSIONS The high prevalence of Axis I and II comorbidity in major depression may be explained, at least in part, by the presence of atypical depression. Our findings also suggest that the increased Axis I comorbidity observed in atypical depression is independent of the effects of personality disorders and is probably a direct effect of atypical depression subtype. Future research should confirm whether clinical findings associated with atypical depression are independent of their association with personality disorders in a larger sample of depressed patients and also examine treatment implications in atypical depression other than a preferential monoamine oxidase inhibitor responsivity.