title: Optimal weight gain during twin pregnancy in Japanese women with favorable perinatal outcomes.
abstract: OBJECTIVE
  We examined the optimal weight gain in the healthy Japanese women with favorable perinatal outcomes of (dichorionic) twin pregnancy.
  
  
  METHODS
  We calculated the average weight gain in the women whose height was 150-164 cm with favorable perinatal outcomes of dichorionic twin pregnancy set for this study. The women were categorized to underweight, normal, overweight and obese based on the pre-pregnancy body mass index (BMI) categories according to the Institute of Medicine (IOM) and the World Health Organization (WHO) body mass index (BMI) cutoffs.
  
  
  RESULTS
  The average GWG in the normal-weight women with the favorable perinatal outcomes was 13.9 ± 3.6 kg. It was significantly different from that in the underweight, overweight and obese women according to the both 2 BMI cutoffs by Student's t-test (p < 0.01).
  
  
  CONCLUSIONS
  There are optimal ranges of weight gain during twin pregnancy based on the BMI classification.
authors.affiliation: a Department of Obstetrics and Gynecology , Japanese Red Cross Katsushika Maternity Hospital , Tokyo , Japan.
authors.forename: Shunji
authors.initials: S
authors.lastname: Suzuki
mesh_terms: D000328:Adult; D044466:Asian People; D005260:Female; D006801:Humans; D011247:Pregnancy; D059285:Pregnancy, Twin / Q000502:physiology*; D012189:Retrospective Studies; D015430:Weight Gain
keywords: Gestational weight gain; Japanese women; favorable perinatal outcomes; twin pregnancy