According to the NIMH-funded Course and Outcome of Bipolar Youth study, 25% of children with bipolar disorder not otherwise specified (NOS) convert to bipolar I or II disorder within about 18 months.

• 据NIMH资助的双相青春期研究结果，25%25的儿童双相患者在18个月内，成为了双相I型或II型（未有特殊说明NOS）。