title: Maternal body mass index and gestational weight gain and their association with perinatal outcomes in Viet Nam.
abstract: OBJECTIVE
  To examine the association between gestational weight gain and maternal body mass index (BMI) among Vietnamese women and the risk of delivering an infant too small or too large for gestational age.
  
  
  METHODS
  A prospective health-facility-based study of 2989 pregnant Vietnamese women was conducted in the city of Nha Trang in 2007-2008. Cubic logistic regression was used to investigate the association of interest. Infants were classified into weight-for-gestational-age categories according to weight centiles for the Asian population. Gestational age was based on the date of last menstrual period and adjusted by the results of first-trimester ultrasound.
  
  
  RESULTS
  BMI was low (< 18.5), normal (18.5-22.9) and high (≥ 23.0) in 26.1%, 65.4% and 8.5% of the women, respectively. In each of these BMI categories, the percentage of women who delivered infants too small for gestational age was 18.1, 10.0 and 9.4, respectively, and the mean gestational weight gain was 12.5 kg (standard deviation, SD: ± 3.6), 12.2 kg (SD: ± 3.8) and 11.5 kg (SD: ± 4.7), respectively. Among women with low BMI, the risk of delivering an infant too small for gestational age ranged from approximately 40% if the gestational weight gain was < 5 kg to 20% if it was 5-10 kg.
  
  
  CONCLUSIONS
  Having a low BMI, commonly found in Viet Nam, puts women at risk of delivering an infant too small for gestational age, especially when total maternal gestational weight gain is < 10 kg.
authors.affiliation: Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Erika
authors.initials: E
authors.lastname: Ota
authors.forename: Megumi
authors.initials: M
authors.lastname: Haruna
authors.forename: Motoi
authors.initials: M
authors.lastname: Suzuki
authors.forename: Dang Duc
authors.initials: DD
authors.lastname: Anh
authors.forename: Le Huu
authors.initials: le H
authors.lastname: Tho
authors.forename: Nguyen Thi Thanh
authors.initials: NT
authors.lastname: Tam
authors.forename: Vu Dinh
authors.initials: VD
authors.lastname: Thiem
authors.forename: Nguyen Thi Hien
authors.initials: NT
authors.lastname: Anh
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Isozaki
authors.forename: Kenji
authors.initials: K
authors.lastname: Shibuya
authors.forename: Koya
authors.initials: K
authors.lastname: Ariyoshi
authors.forename: Sachiyo
authors.initials: S
authors.lastname: Murashima
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Moriuchi
authors.forename: Hideki
authors.initials: H
authors.lastname: Yanai
mesh_terms: D000328:Adult; D001724:Birth Weight; D015992:Body Mass Index; D005260:Female; D005865:Gestational Age; D006801:Humans; D016015:Logistic Models; D008429:Maternal Welfare; D011247:Pregnancy; D011256:Pregnancy Outcome; D011295:Prenatal Care; D016730:Program Development; D011446:Prospective Studies; D012307:Risk Factors; D014744:Vietnam; D015430:Weight Gain