The global estimated lifetime prevalence of bipolar disorder among adults range from 1 to 3 percent. The annual incidence is estimated to vary from 0.3 to 1.2 percent worldwide. According to the World Mental Health Survey Initiative, the lifetime prevalence of<unk>  was found to be 0.4%, with a 12-month prevalence of 0.3%. Other meta-analyses have found lifetime prevalence of<unk>  up to 1.57%. In the United States, the estimated lifetime prevalence of<unk>  was found to be 1.1%, with a 12-month prevalence of 0.8%. The mean age of onset for<unk>  was 20 years. Thus far, there have been no studies that have conclusively demonstrated that an unequal distribution of bipolar disorders across sex and ethnicity exists. It must be noted that a vast majority of studies and meta-analysis do not differentiate between BP-I and<unk> , and current epidemiology data may not accurately describe true prevalence and incidence. In addition,<unk>  is underdiagnosed in practice, and it is easy to miss milder forms of the condition.
Bipolar II disorder
Bipolar I disorder
Bipolar disorder
Bipolar disorder not otherwise specified
Major depressive disorder
Major depressive episode
Cyclothymia
Dysthymia