title: Prepregnancy maternal body mass index and preterm delivery.
abstract: OBJECTIVE
  The purpose of this study was to determine the influence of maternal prepregnancy body mass index on preterm delivery (PTD), controlling for health and lifestyle variables.
  
  
  METHODS
  Prospective data were from 83,544 pregnancies in the Norwegian Mother and Child Cohort Study. PTD was divided into early PTD (22 + 0 to 31 + 6 weeks' gestation) and late PTD (32 + 0 to 36 + 6 weeks' gestation).
  
  
  RESULTS
  The overall prevalence of PTD was 5.1%. Increased body mass index was associated with an increased risk of PTD; adjusted odds ratio (aOR) ranged from 1.11 (95% confidence interval [CI], 1.03-1.20) for preobesity to 2.00 (95% CI, 1.48-2.71) for grade-III obesity in the group that included all PTD subgroups. Grade-III obese women had an increased risk of both early and late PTD: aOR, 3.24 (95% CI, 1.71-6.14) and 1.81 (95% CI, 1.29-2.54), respectively.
  
  
  CONCLUSIONS
  Prepregnancy maternal overweight increases the risk of both early and late PTD.
authors: Department of Obstetrics and Gynecology, Sahlgrenska University Hospital/East, Gothenburg, Sweden. ali.khatibi_esfangani@vgregion.se
authors: Ali
authors: A
authors: Khatibi
authors: Anne-Lise
authors: AL
authors: Brantsaeter
authors: Verena
authors: V
authors: Sengpiel
authors: Marian
authors: M
authors: Kacerovsky
authors: Per
authors: P
authors: Magnus
authors: Nils-Halvdan
authors: NH
authors: Morken
authors: Ronny
authors: R
authors: Myhre
authors: Nina
authors: N
authors: Gunnes
authors: Bo
authors: B
authors: Jacobsson
mesh_terms: D000328:Adult; D015992:Body Mass Index; D005260:Female; D006801:Humans; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D011446:Prospective Studies; D055815:Young Adult