title: The identification of disease entities and the relationship between schizophrenic and affective psychoses.
abstract: A method is described for identifying a genuine boundary between related syndromes, if one exists, by demonstrating a non-linear relationship between symptomatology and outcome. The technique was applied to the putative boundary between schizophrenic and affective psychoses, but a non-linear relationship could not be demonstrated.
mesh_terms: D000341:Affective Disorders, Psychotic / Q000145:classification / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005500:Follow-Up Studies; D006801:Humans; D007902:Length of Stay; D008722:Methods; D012559:Schizophrenia / Q000145:classification / Q000175:diagnosis*; D012959:Socioeconomic Factors