title: Oral contraception and twinning: an epidemiologic study.
abstract: Among 4,428 women studied at five large hospitals in Connecticut, those conceiving within two months of cessation of oral contraceptive use had a twofold increased rate of delivering twins. This increase was found in both black and white women. Analysis of unlike and like sex twins indicates that this effect seems to clearly depend on an increased rate of dizygous twinning.
mesh_terms: D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D011247:Pregnancy; D014427:Twins
chemical_list: D003276:Contraceptives, Oral