title: Anencephaly in Japan: paternal age, maternal age and birth order.
abstract: The statistical association between incidence of anencephaly and paternal age, maternal age and birth order was analysed in 1815 cases of foetal deaths with anencephaly reported during 1975--6. The birth order association was confirmed with an extremely high degree of statistical significance.
mesh_terms: D000293:Adolescent; D000328:Adult; D000757:Anencephaly / Q000453:epidemiology / Q000235:genetics*; D001722:Birth Order; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007086:Illegitimacy; D007564:Japan; D008297:Male; D008423:Maternal Age; D008954:Models, Biological; D010331:Paternal Age; D011247:Pregnancy; D012044:Regression Analysis; D012306:Risk