title: Reduced versus nonreduced twin pregnancies: obstetric performance in a cohort of interventional conceptions.
abstract: OBJECTIVE
  To describe the obstetric performance of a selected population of twin pregnancies, comparing reduced vs. nonreduced twin pregnancies after the successful completion of the 12th week.
  
  
  METHODS
  Prospective cohort study.
  
  
  METHODS
  Outpatient fertility center.
  
  
  METHODS
  A cohort of 464 twin pregnancies including both ovulation induction and assisted reproductive technology pregnancies.
  
  
  METHODS
  Fetal reduction.
  
  
  METHODS
  Pregnancy outcome and prematurity rate.
  
  
  RESULTS
  The study group included a cohort of 464 twin pregnancies in a single outpatient fertility center: 70 cases of twin pregnancies after a reduction procedure (15.1%) and 394 cases of nonreduced twins (84.9%). Of the nonreduced twin pregnancies, 8.6% went through an abortion, as compared with 4.3% in the reduced group. Mean age at delivery was also comparable between the two groups (35.8 weeks in the reduced group, 35.6 weeks in the nonreduced group), as was the rate of severe prematurity (3.3% in the nonreduced group, 2.9% in the reduced group).
  
  
  CONCLUSIONS
  Our work supports a lack of causative relationship between fetal reduction and pregnancy endpoint.
authors.affiliation: Department of Obstetrics and Gynecology, Meir Medical Center, Kfar-Saba, Israel. Electronic address: anat.klement@gmail.com.
authors.forename: Anat
authors.initials: A
authors.lastname: Hershko-Klement
authors.affiliation: Department of Obstetrics and Gynecology, Sheba Medical Center Tel-Hashomer, Sakler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
authors.forename: Shlomo
authors.initials: S
authors.lastname: Lipitz
authors.affiliation: Department of Obstetrics and Gynecology, Meir Medical Center, Kfar-Saba, Israel.
authors.forename: Amir
authors.initials: A
authors.lastname: Wiser
authors.affiliation: Department of Obstetrics and Gynecology, Meir Medical Center, Kfar-Saba, Israel; Department of Obstetrics and Gynecology, Assuta Medical Center, Tel-Aviv, Israel.
authors.forename: Arie
authors.initials: A
authors.lastname: Berkovitz
mesh_terms: D000022:Abortion, Spontaneous; D000328:Adult; D015331:Cohort Studies; D005260:Female; D006801:Humans; D010062:Ovulation Induction; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D018607:Pregnancy Reduction, Multifetal / Q000379:methods* / Q000523:psychology; D059285:Pregnancy, Twin / Q000502:physiology* / Q000706:statistics & numerical data*; D011446:Prospective Studies; D012067:Religion; D027724:Reproductive Techniques, Assisted; D012189:Retrospective Studies; D016019:Survival Analysis