title: The impact of change in pregnancy body mass index on cesarean delivery.
abstract: OBJECTIVE
  To examine the impact of pregnancy changes in body mass index (BMI) on the incidence of cesarean delivery.
  
  
  METHODS
  This is a retrospective cohort study using linked birth certificate and discharge diagnosis data from the year 2007. Adjusted odds ratios (aOR) were calculated for the outcome of cesarean delivery, as a function of a categorical change in pregnancy BMI (kg/m(2)): BMI loss (BMI change<-0.5), no change (-0.5 to 0.5), minimal (0.6 to 5), moderate (5.1 to 10) and excessive (>10). The impact of pregnancy change in BMI was determined for the entire cohort and then stratified by prepregnancy BMI category.
  
  
  RESULTS
  The study population consisted of 436 414 women with singleton gestations. When compared to women with no net change in BMI, women with excessive BMI changes collectively had a 80% increased incidence of cesarean delivery (aOR = 1.78). By prepregnancy obesity class, the aOR for cesarean delivery in women with excessive BMI change were: normal weight (aOR = 2.25), overweight (aOR = 2.39), obese class I (aOR = 2.23), obese class II (aOR = 2.56) and obese class III (aOR = 2.08).
  
  
  CONCLUSIONS
  The odds of cesarean delivery were uniformly increased in all prepregnancy BMI categories as net BMI change increased. These data illustrate that all women, not just the overweight and obese, are at significantly increased risk of cesarean delivery with excessive BMI change during pregnancy.
authors.affiliation: Department of Obstetrics and Gynecology, University of California, Irvine , Orange, CA , USA .
authors.forename: Morgan L
authors.initials: ML
authors.lastname: Swank
authors.forename: Aaron B
authors.initials: AB
authors.lastname: Caughey
authors.forename: Christine K
authors.initials: CK
authors.lastname: Farinelli
authors.forename: Elliott K
authors.initials: EK
authors.lastname: Main
authors.forename: Kathryn A
authors.initials: KA
authors.lastname: Melsop
authors.forename: William M
authors.initials: WM
authors.lastname: Gilbert
authors.forename: Judith H
authors.initials: JH
authors.lastname: Chung
mesh_terms: D000328:Adult; D015992:Body Mass Index; D002585:Cesarean Section / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D056865:Ideal Body Weight; D015994:Incidence; D009765:Obesity / Q000453:epidemiology; D050177:Overweight / Q000453:epidemiology; D011247:Pregnancy; D012189:Retrospective Studies; D015430:Weight Gain / Q000502:physiology*; D055815:Young Adult