title: A genetic study of schizophrenia pedigree. I. Demographic studies: sample description, age of onset, ascertainment and classification.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D011247:Pregnancy; D012559:Schizophrenia / Q000235:genetics*; D012737:Sex Factors; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic