Research criteria for Depressive Personality Disorder
A. A pervasive pattern of depressive cognitions and behaviors begining by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:
B. Does not occur exclusively during Major Depressive Episodes and is not better accounted for by Dysthymic Disorder.
Source: American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders: DSM-IV. 4th ed. Washington: APA, 1994. pg. 733.