Depression represents the predominant abnormal mood state for treated outpatients with bipolar I and II disorder. Patients have depression three times longer than mania. A large cohort of bipolar 1 and bipolar 2 patients were studied longitudinally. Clinician-adjusted self-ratings of mood were completed daily
for one year for naturalistically treated outpatients with bipolar I (n = 405) or
bipolar II (n = 102) disorder.
The depression/mania ratios were comparable between bipolar I and bipolar II patients in contrast to earlier research.
Naturalistic follow-up with all kinds of medication and interventions
Bipolar Disord. 2007 Aug;9(5):531-5.
Three times more days depressed than manic or hypomanic in both bipolar I and
bipolar II disorder.