title: Preterm deliveries in twin pregnancies in Oxford.
abstract: The incidence of preterm delivery among twin maternities in Oxford between 1973 and 1983, was 39.4%. Preterm delivery was more common in MZ than DZ twins, and this was associated with higher incidence of spontaneous rupture of the membranes associated with monozygosity.
mesh_terms: D004739:England; D005260:Female; D005322:Premature Rupture of Fetal Membranes / Q000453:epidemiology; D006801:Humans; D007231:Infant, Newborn; D007752:Obstetric Labor, Premature / Q000453:epidemiology / Q000209:etiology*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012744:Sex Ratio; D014427:Twins; D014430:Twins, Monozygotic