Mean Beck Depression Inventory-II total scores by type of bipolar episode.

The 1996 Beck Depression Inventory-II was administered to 120 outpatients diagnosed with DSM-IV-TR bipolar I disorders who had recently experienced manic, mixed, or depressed episodes. A focused contrast supported the hypothesis that the mean Beck-II total score for the 40 patients with depressed episodes (M=34.1, SD = 13.2) was higher than the mean Beck-II total score for the 40 patients with mixed episodes (M=25.9, SD= 13.6) which was, in turn, higher than the mean Beck-II total score for the 40 patients with manic episodes (M= 11.7, SD=7.8, p<.001). The Beck Depression Inventory-II appears to be useful for measuring self-reported depression in patients with bipolar I disorders.