title: Season of birth of siblings of schizophrenic patients.
abstract: The hypothesis that mothers of winter-spring-born schizophrenics have an unusual pattern of conception which results in an excess of winter-spring births was tested by studying the distribution of birth-dates of 401 siblings of 120 winter-spring-born schizophrenics and 157 siblings of 59 winter-spring-born controls. All analyses were gender-specific. The results suggest there is no association between the probability of a winter-spring date of birth and being a sibling of a winter-spring-born schizophrenic or control.
authors.affiliation: Department of Psychiatry and Behavioral Sciences, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21203.
authors.forename: A E
authors.initials: AE
authors.lastname: Pulver
authors.forename: K Y
authors.initials: KY
authors.lastname: Liang
authors.forename: P S
authors.initials: PS
authors.lastname: Wolyniec
authors.forename: J
authors.initials: J
authors.lastname: McGrath
authors.forename: B A
authors.initials: BA
authors.lastname: Melton
authors.forename: L
authors.initials: L
authors.lastname: Adler
authors.forename: B
authors.initials: B
authors.lastname: Childs
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D016017:Odds Ratio; D012307:Risk Factors; D012559:Schizophrenia / Q000175:diagnosis / Q000235:genetics*; D012565:Schizophrenic Psychology; D012621:Seasons; D012801:Sibling Relations