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The diagnostic groups differed with regard to suicidal attempts as well, with the lowest rate involving the pure dysthymia group (16%) and the highest rate involving the double depression group (54%).
However to investigate whether the patients with persistent depression constituted a homogenous group in terms of socio-demographic and clinical variables, this group was divided into three sub-groups (dysthymia, double depression, chronic MD), two of which consisted of 20 patients.
These patients fell into two categories: those with depression and double depression on initial evaluation (active disease; n = 137) and those with dysthymia or sub-clinical symptoms (symptoms only; n = 129).