title: Obstetric risks of pregnancy in women less than 18 years old.
abstract: OBJECTIVE
  To quantify the age-related risks of adverse outcome during pregnancy in women less than 18 years old.
  
  
  METHODS
  We analyzed data from 341,708 completed singleton pregnancies in the North West Thames region between 1988 and 1997. Pregnancy outcomes were compared by age at delivery in women less than 18 years old (n = 5246) and 18-34 years old (n = 336,462); women 35 years old or older (n = 48,658) were excluded. Data are presented as percentages of women less than 18 and 18-34-year-old women, with adjusted odds ratios (OR) and 99% confidence intervals (CI).
  
  
  RESULTS
  Pregnancy in women less than 18 years old was associated with increased risk of preterm labor before 32 weeks' gestation (OR 1.41, CI 1.02, 1.90), maternal anemia (OR 1.82, CI 1.63, 2.03), chest infection (OR 2.70, CI 1.21, 6.70), and urinary tract infection (OR 1.60, CI 1.11, 2.31), but less obstetric intervention. Operative vaginal delivery (OR 0. 46, CI 0.41, 0.56), elective cesarean (OR 0.47, CI 0.35, 0.65), or emergency cesarean (OR 0.45, CI 0.38, 0.53) were all less likely in women aged less than 18 years. Women less than 18 years old were no more likely to have stillbirths (OR 0.75, CI 0.42, 1.34) or small-for-gestational-age infants (OR 0.95, CI 0.82, 1.09) than women aged 18-34 years.
  
  
  CONCLUSIONS
  Pregnant women less than 18 years old were more likely to deliver preterm than older women. In most other respects they have less maternal and perinatal morbidity and were more likely to have normal vaginal deliveries.
authors.affiliation: Imperial College of Science Technology and Medicine, St. Mary's Campus, London, United Kingdom.
authors.forename: M C
authors.initials: MC
authors.lastname: Jolly
authors.forename: N
authors.initials: N
authors.lastname: Sebire
authors.forename: J
authors.initials: J
authors.lastname: Harris
authors.forename: S
authors.initials: S
authors.lastname: Robinson
authors.forename: L
authors.initials: L
authors.lastname: Regan
mesh_terms: D000293:Adolescent; D000328:Adult; D001724:Birth Weight; D016001:Confidence Intervals; D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D007752:Obstetric Labor, Premature / Q000453:epidemiology* / Q000209:etiology; D016017:Odds Ratio; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology* / Q000209:etiology; D011256:Pregnancy Outcome; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D012306:Risk