The global prevalence of bipolar disorders

Estimates from the WHO World Mental Health survey found that rates of comorbid disorders were significantly greater among those with bipolar I disorder (88.2%) and bipolar II disorder (83.1%), than among those with subthreshold bipolar disorder (69.1%).¹

Reference:
1. Merikangas KR, Jin R, He JP, et al. Prevalence and correlates of bipolar spectrum disorder in the world mental health survey initiative. Arch Gen Psychiatry 2011; 68 (3): 241–251.