Only a few of the community surveys have included assessment of mania or hypomania, in part, because of the widely held belief that these conditions are too rare in children. The current, or 12-month prevalence rates of mania, hypomania, and bipolar disorder in populationbased studies of youth range from 0% to 0.9% in children age 14 to 18.8,35 Lifetime prevalence rates for bipolar disorder among youth range from 0% to 2.1%, and the lifetime prevalence rate for hypomania ranges between 0% and 0.4%. The results of most, community surveys find nearly equal rates of bipolar disorder in males and females.
