title: Previous cesarean delivery and the risk of ectopic pregnancy.
abstract: OBJECTIVE
  To determine whether previous cesarean delivery is an independent risk factor for ectopic pregnancy.
  
  
  METHODS
  We analyzed data collected between October 1988 and August 1990 from a case-control study of ectopic pregnancy among parous, black, non-Hispanic women, 18-44 years old, at a major metropolitan hospital in Georgia. Cases were 138 women with confirmed ectopic pregnancy; controls were 842 women either seeking abortion or delivering an infant. Unconditional logistic regression was used to estimate the relative risk while controlling for the effects of potential confounders selected a priori.
  
  
  RESULTS
  Adjusted for age, parity, marital status, history of pelvic inflammatory disease, infertility, douching, and smoking, the odds ratio was 0.6 (95% confidence interval 0.4-1.1), indicating no significant association.
  
  
  CONCLUSIONS
  We found no evidence of an increased risk of ectopic pregnancy related to previous cesarean delivery.
authors.affiliation: Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Kendrick
authors.forename: E F
authors.initials: EF
authors.lastname: Tierney
authors.forename: H W
authors.initials: HW
authors.lastname: Lawson
authors.forename: L T
authors.initials: LT
authors.lastname: Strauss
authors.forename: L
authors.initials: L
authors.lastname: Klein
authors.forename: H K
authors.initials: HK
authors.lastname: Atrash
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002585:Cesarean Section; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D016015:Logistic Models; D016017:Odds Ratio; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology*; D012307:Risk Factors