title: Risk factors for placenta praevia in southern Nigeria.
abstract: OBJECTIVE
  To determine the risk factors for placenta praevia in Ile-Ife, southern Nigeria.
  
  
  METHODS
  A prospective case control study.
  
  
  METHODS
  A tertiary center--Obafemi Awolowo University Teaching Hospital, Ile-Ife, southern Nigeria.
  
  
  METHODS
  One hundred and thirty six patients with confirmed placenta praevia constituted the cases. Controls consisted of one hundred and thirty six patients who delivered at term immediately after each indexed case and did not have placenta praevia.
  
  
  RESULTS
  Cases and controls were similar in terms of twin deliveries (P = 0.72) and past history of uterine surgery (P = 0.47). After adjusting for confounders, factors associated with risk of placenta praevia were history of retained placenta [OR = 6.7(95% CI 1.2-36.6)], previous caesarean section [OR = 4.7, (95% CI 1.9-11.4)], previous abortion [OR = 2.9 (95% CI 1.1-5.1)], grand multiparity [OR = 2.1 (95% CI 1.6-7.1)] and age over 35 years [OR = 1.4 (95% CI 1.2-6.6)].
  
  
  CONCLUSIONS
  From our study, the risk factors for placenta praevia are a history of retained placenta, previous caesarean section, previous abortion, grand multiparity and maternal age over 35 years.
authors.affiliation: Department of Obstetrics and Gynaecology, North Tyneside General Hospital, Northshields, NE29 8NH, England.
authors.forename: A O
authors.initials: AO
authors.lastname: Eniola
authors.forename: A U
authors.initials: AU
authors.lastname: Bako
authors.forename: D O
authors.initials: DO
authors.lastname: Selo-Ojeme
mesh_terms: D000028:Abortion, Induced / Q000009:adverse effects; D000022:Abortion, Spontaneous / Q000150:complications; D000328:Adult; D016022:Case-Control Studies; D002585:Cesarean Section / Q000009:adverse effects; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006785:Hospitals, University; D006801:Humans; D008423:Maternal Age; D009549:Nigeria / Q000453:epidemiology; D010298:Parity; D010923:Placenta Previa / Q000453:epidemiology* / Q000209:etiology*; D018457:Placenta, Retained / Q000150:complications; D011247:Pregnancy; D018566:Pregnancy, High-Risk; D011446:Prospective Studies; D012307:Risk Factors