A cluster analysis of manic states.

A cluster analysis was performed on 81 manically disturbed patients assessed at interview on items of manic symptomatology and general psychopathology. Four groups were obtained: (1) a mildly excited group, (2) a group characterized by elation and speech disturbance, (3) a small severely disturbed excited group, more schizophrenic than manic, and (4) a group characterized by aggressive overactivity.