title: A contribution to the validity of Leonhard's classification of endogenous psychoses.
abstract: The author made a clinical-genetical study of the schizophrenias and cycloid (schizoaffective) psychoses following the Leonhardian classification, using the traditional pedigree analysis and multiple threshold method. According to the latter method--on the basis of phenotypical correlations--the systematic schizophrenias could be clearly distinguished from the cycloid psychoses, while the non-systematic category presumably occupies a genetical position between the two former categories.
mesh_terms: D000293:Adolescent; D000328:Adult; D001714:Bipolar Disorder / Q000145:classification; D006801:Humans; D008875:Middle Aged; D010375:Pedigree; D011618:Psychotic Disorders / Q000145:classification* / Q000235:genetics; D012559:Schizophrenia / Q000145:classification