Demographic, historical, and symptomatic features of the nonmanic psychoses.

Consecutively admitted patients with nonmanic psychosis were more likely to meet Research Diagnostic Criteria (RDC) for schizoaffective disorder, depressed type (N = 47), than for psychotic major depression (N = 29) or schizophrenia (N = 21). Although the RDC duration requirements for these three disorders are quite similar, schizophrenics had already experienced much more chronicity as reflected in episode duration, psychosocial impairment during the preceding 5 years, marital status, and low likelihood of prior remission. Schizoaffective patients took intermediate positions in these measures in accord with the majority of follow-up studies comparing these disorders. Although the RDC specify the same array of psychotic symptoms for schizoaffectives and for schizophrenics, these symptoms were significantly more prominent among the schizophrenics. Conversely, although this system also specifies the same list of depressive symptoms for major depression and schizoaffective depression, symptoms of endogenous depression were significantly more prominent in the major depression group. Thus, among functionally psychotic patients, those with schizophrenia-like symptoms have milder and less typical depressive symptoms whereas those with depressive syndromes have fewer and milder schizophrenia-like symptoms.