Dysthymia has a point prevelance of 3% and a lifetime prevalence of 6%.
Females are 3x more likely affected than males.
Up to 75% of people with dysthymia will also develop a major depressive disorder within 5 years.
COmmon comorbidities include personality disorders (especially borderline, histrionic, narcissistic, avoidant, and dependent), substance abuse, and major depressive disorders
Dysthymia is not substance-induced, with no MDE within the first two years. It is diagnosed with:
depressed mood for most of the day, for more days than not, either subjectively or objectively, for at least two years
-and-
presence of at least two of the following:
During this time, the person cannot have been without symptoms for more than 2 months at a time.