Age-specific cumulative incidence and age-of-onset distribution of (A) unipolar hypomania/mania, unipolar depression, and bipolar depressiona and of (B) unipolar hypomania/mania with or without minor depressiona. HE = hypomanic episode; ME = manic episode; MDE = major depressive episode; MinDE = minor depressive episode.
aFor bipolar depression cases (A) and (hypo)mania with minor depression cases (B), age of onset is defined as the minimum age of onset of HE/ME and MDE (A) and MinDE (B).