Using factor analysis, Cassidy et alArticle report on the interrelationship of manic signs and symptoms in a cohort of 237 bipolar subjects. Five independent factors of manic signs and symptoms were found: dysphoric mood, psychomotor pressure, psychosis, hedonic drive, and irritable aggression. Each of these is useful for the characterization and study of manic patients. The distribution of scores on the first factor, dysphoric mood, was bimodal, confirming that mixed mania is a distinct subtype.
This Month in Archives of General Psychiatry. Arch Gen Psychiatry. 1998;55(1):11. doi:10.1001/archpsyc.55.1.11