title: Pregnancy outcome among twins conceived after subfertility treatment compared with natural twins: A population-based study.
abstract: Pregnancy outcome and characteristics of women who conceive following subfertility treatment remains a subject of great interest. We analyzed these variables among 199 women who delivered a registerable twin birth compared with 1773 women who delivered a naturally conceived twin birth in a population-based obstetric cohort drawn from around Oxford, England. Treatment was restricted to conceptions involving simple ovulation induction only. Treated mothers were of significantly higher social class and older, more likely to deliver girls and to be delivered by cesarean section, and significantly less likely to be smokers at the time of antenatal booking and to have delivered previous pregnancies. Pregnancy outcome was similar between the two groups for most measures, with the exception of birthweight which was lower in treated twins, though not significantly so. Overall the results are reassuring with respect to outcome in twin pregnancies following simple ovulation induction.
authors.affiliation: Childhood Cancer Research Group, University of Oxford Department of Pediatrics, Oxford, United Kingdom. michael.murphy@ccrg.oxford.ac.uk
authors.forename: Michael F G
authors.initials: MF
authors.lastname: Murphy
authors.forename: Rachel E
authors.initials: RE
authors.lastname: Neale
authors.forename: Kate
authors.initials: K
authors.lastname: Hey
authors.forename: Valerie A
authors.initials: VA
authors.lastname: Seagroatt
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Goldacre
authors.forename: Martin P
authors.initials: MP
authors.lastname: Vessey
authors.forename: Bryony M
authors.initials: BM
authors.lastname: Willis
authors.forename: J Douglas
authors.initials: JD
authors.lastname: Ellis
authors.forename: David H
authors.initials: DH
authors.lastname: Barlow
mesh_terms: D000328:Adult; D000367:Age Factors; D001724:Birth Weight; D005260:Female; D005306:Fertilization; D006801:Humans; D007247:Infertility, Female / Q000453:epidemiology / Q000628:therapy*; D008297:Male; D010062:Ovulation Induction; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology; D012959:Socioeconomic Factors