title: Birth weight discordance in spontaneous versus induced twins: impact on perinatal outcome.
abstract: OBJECTIVE
  To compare the rate of birth weight discordance and perinatal outcome of twin pregnancies after assisted reproduction with that of spontaneous twins.
  
  
  METHODS
  A total of 12,920 deliveries were analyzed retrospectively. Seventy-five twin pregnancies after ART were compared to the 94 spontaneous counterparts. Birth weight discordance was defined as a difference of 20% or more.
  
  
  RESULTS
  Discordance rate was elevated (25.3% vs. 17.0%) among ART twins. SGA was increased and NICU admission was more frequent in discordant group. Unlike-sexed twins were more prevalent (73.7% vs. 37.5%) among discordants after ART.
  
  
  CONCLUSIONS
  ART can increase discordance rate which can elevate perinatal risk.
authors.affiliation: Center for Assisted Reproduction, Kaáli Institute, University of Szeged, Hungary. zjkaali@mail.tiszanet.hu
authors.forename: J
authors.initials: J
authors.lastname: Zádori
authors.forename: Z
authors.initials: Z
authors.lastname: Kozinszky
authors.forename: H
authors.initials: H
authors.lastname: Orvos
authors.forename: M
authors.initials: M
authors.lastname: Katona
authors.forename: S G
authors.initials: SG
authors.lastname: Kaáli
authors.forename: A
authors.initials: A
authors.lastname: Pál
mesh_terms: D000328:Adult; D001724:Birth Weight; D000013:Congenital Abnormalities / Q000453:epidemiology / Q000209:etiology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007233:Infant, Postmature; D011247:Pregnancy; D015995:Prevalence; D027724:Reproductive Techniques, Assisted / Q000009:adverse effects*; D012189:Retrospective Studies; D012307:Risk Factors; D014427:Twins / Q000502:physiology*