title: [Clinical analyses of risk factors related to ectopic pregnancy].
abstract: OBJECTIVE
  To conduct an epidemiological survey on the relevant risk factors of ectopic pregnancy (EP) and provide scientific rationales for prevention and reducing its incidence.
  
  
  METHODS
  During June 2010 to December 2011 at three local hospitals, a total of 800 patients with a diagnosis of EP responded to a questionnaire survey for understanding the risk factors of EP. And another 700 cases of normal early pregnancy women were selected as control group. Both multi and uni-factorial regression analyses were performed for the acquired clinical data. And the high-risk factors of EP were screened.
  
  
  RESULTS
  Among them, the age distribution was ≤ 25 years (n = 175, 25.5%), 26-30 years (n = 302, 37.8%) and 31-35 years (n = 213, 26.6%). No contraceptive measure was adopted for 259 women (32.4%). The risk factors related to EP included oral emergency contraceptives, intrauterine device (IUD), pelvic inflammatory disease, infertility history, previous EP, smoking and age, etc. Based upon multivariate Logistic regression analysis of screening results, the decreasing odds rations were infertility, EP history, smoking history, emergency contraceptive use, history of EP, IUD, pelvic inflammatory disease and age.
  
  
  CONCLUSIONS
  The risks of EP are affected by many factors, including infertility, EP history, smoking history, emergency contraceptive use, history of EP, IUD, pelvic inflammatory disease and age.
authors.affiliation: International Peace Maternity & Child Health Hospital, Shanghai 200030, China. Email: cathywchen@126.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Qiu
authors.forename: Yincheng
authors.initials: Y
authors.lastname: Teng
authors.forename: Wenyan
authors.initials: W
authors.lastname: Zou
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
mesh_terms: D000328:Adult; D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D015994:Incidence; D007434:Intrauterine Devices; D000292:Pelvic Inflammatory Disease; D011247:Pregnancy; D011271:Pregnancy, Ectopic; D012307:Risk Factors
chemical_list: D003276:Contraceptives, Oral