“…Thus, bipolar disorders have their onset at an early age, with a mean onset between the ages of 15 and 19 years, as reported in reviews on the initial prodrome and recognition of bipolar disorders2,3) and they follow a serious course of illness. However, there is skepticism about the prevalence, validity and stability of bipolar disorder in children and adolescents outside the United States4) bipolar disorder is rarely diagnosed, and there is no epidemiological report in children and adolescents in South Korea.…”