title: Association of pre-pregnancy maternal body mass and maternal weight gain to newborn outcomes in twin pregnancies.
abstract: BACKGROUND
  The rate of twin gestations is now about 3% of all pregnancies. The study objective was to investigate the association between twin pregnancy newborn outcomes and maternal weight.
  
  
  METHODS
  Birth certificate information of 1,342 sets of live-born twin deliveries collected in a regional perinatal data system from a contiguous eight-county area in upstate New York was studied.
  
  
  RESULTS
  The obese maternal pre-pregnancy BMI category was correlated with an increased odds ratio of a "Type I" (both a > or =36-week gestation and a > or =2,500-g average twin weight) newborn outcome (adjusted OR 1.92; 95% CI: 1.43, 2.56). For total maternal weight gain, there was an increased odds ratio of having a Type I newborn outcome with >25 kg weight gain (adjusted OR 2.24; 95% CI: 1.51, 3.33).
  
  
  CONCLUSIONS
  Based on this population-based study, we conclude that both maternal pre-pregnancy BMI and total maternal weight gain are associated with twin newborn outcomes.
authors: Department of Gynecology--Obstetrics, University at Buffalo, The State University of New York, Buffalo, NY 14222, USA. jyeh@buffalo.edu
authors: John
authors: J
authors: Yeh
authors: James A
authors: JA
authors: Shelton
mesh_terms: D000328:Adult; D001724:Birth Weight / Q000502:physiology*; D015992:Body Mass Index; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D009765:Obesity / Q000150:complications; D050177:Overweight; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology* / Q000209:etiology; D011256:Pregnancy Outcome; D014427:Twins; D015430:Weight Gain / Q000502:physiology*