title: Maternal prepregnancy body mass index and delivery of a preterm infant in missouri 1998-2000.
abstract: OBJECTIVE
  To determine risk of delivering a preterm infant (<37 weeks) in overweight/obese women.
  
  
  METHODS
  Descriptive.
  
  
  METHODS
  Population-based sample of 169,881 singleton Missouri birth certificate records for 1998-2000.
  
  
  METHODS
  Prepregnancy body mass index (BMI): underweight BMI<19.8; normal BMI=19.8-24.9; overweight BMI=25-29.9; and obese BMI> or =30; and preterm birth (<37 completed weeks' gestation).
  
  
  RESULTS
  In each BMI category, the percent of women who delivered a preterm infant is: underweight 11.5%, normal 8.3%, overweight 8.2%, and obese 8.5%. For women with a BMI of overweight (odds ratio [OR] 0.9, 95% confidence interval [CI]=0.8-0.9) and obese (OR 0.8, 95% CI=0.8-0.9), the risk of delivering a preterm infant decreased when compared with women with a BMI<19.8. Black (OR=2.5, 95% CI 2.4-2.6) and Hispanic (OR=1.4, 95% CI 1.2-1.5) women had a higher risk of preterm birth than White women when obesity, diabetes, hypertension, and prenatal care were controlled. Women with diabetes (OR=1.4, 95% CI=1.2-1.5), hypertension (OR=3.2, 95% CI=3.1-3.4), and those who smoked (OR=1.6, 95% CI=1.6-1.7) were at increased risk for a preterm birth.
  
  
  CONCLUSIONS
  Findings suggest that preconception and prenatal care focus on identification and management of risks associated with premature births and maternal risk factors such as diabetes, hypertension, and smoking.
authors.affiliation: College of Nursing, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA. tsj@uwm.edu
authors.forename: Teresa S
authors.initials: TS
authors.lastname: Johnson
authors.forename: Kara J
authors.initials: KJ
authors.lastname: Rottier
authors.forename: Alison
authors.initials: A
authors.lastname: Luellwitz
authors.forename: Russell S
authors.initials: RS
authors.lastname: Kirby
mesh_terms: D000293:Adolescent; D000328:Adult; D001719:Birth Certificates; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008923:Missouri / Q000453:epidemiology; D009765:Obesity / Q000150:complications; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology / Q000209:etiology*; D018570:Risk Assessment; D055815:Young Adult