The identification of disease entities and the relationship between schizophrenic and affective psychoses.

R E Kendell , I F Brockington

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.