title: [Pregnancy outcomes of day-2 versus day-3 embryo transfer in poor responders].
abstract: OBJECTIVE
  To investigate whether the day of embryo transfer (day 2 or day 3) affects clinical pregnancy outcomes in poor responder patients.
  
  
  METHODS
  We retrospectively analyzed the pregnancy rates of 265 initial fresh cycles of in vitro fertilization-embryo transfer (IVF-ET), all transferred on day 2 (n = 169) or day 3 (n = 96) irrespective of quality because of an extremely low number of available embryos.
  
  
  RESULTS
  Among the poor responders aged < 35 years, a higher rate of clinical pregnancy was achieved in the day-3 than in the day-2 group (50% vs 32.43% ; RR = 0.65, 95% CI: 0.43 - 0.99), and among those aged years, the two groups showed similar pregnancy outcomes.
  
  
  CONCLUSIONS
  Shortening the time of embryo culture has no obvious benefit for the pregnancy outcome. For the poor responders under 35 years of age, day-3 embryo transfer may afford an even higher rate of clinical pregnancy.
authors: Center of Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China. cocoxinxb@163.com
authors: Zhi-Min
authors: ZM
authors: Xin
authors: Quan-Le
authors: QL
authors: Zhang
authors: Ying-Pu
authors: YP
authors: Sun
authors: Hai-Xia
authors: HX
authors: Jin
authors: Wen-Yan
authors: WY
authors: Song
mesh_terms: D000328:Adult; D004624:Embryo Transfer / Q000379:methods*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D010053:Ovary / Q000502:physiology*; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D012189:Retrospective Studies