title: Comparing the odds of postpartum haemorrhage in planned home birth against planned hospital birth: results of an observational study of over 500,000 maternities in the UK.
abstract: BACKGROUND
  The aim of this study is to compare the odds of postpartum haemorrhage among women who opt for home birth against the odds of postpartum haemorrhage for those who plan a hospital birth. It is an observational study involving secondary analysis of maternity records, using binary logistic regression modelling. The data relate to pregnancies that received maternity care from one of fifteen hospitals in the former North West Thames Regional Health Authority Area in England, and which resulted in a live or stillbirth in the years 1988-2000 inclusive, excluding 'high-risk' pregnancies, unplanned home births, pre-term births, elective Caesareans and medical inductions.
  
  
  RESULTS
  Even after adjustment for known confounders such as parity, the odds of postpartum haemorrhage (≥1000ml of blood lost) are significantly higher if a hospital birth is intended than if a home birth is intended (odds ratio 2.5, 95% confidence interval 1.7 to 3.8). The 'home birth' group included women who were transferred to hospital during labour or shortly after birth.
  
  
  CONCLUSIONS
  Women and their partners should be advised that the risk of PPH is higher among births planned to take place in hospital compared to births planned to take place at home, but that further research is needed to understand (a) whether the same pattern applies to the more life-threatening categories of PPH, and (b) why hospital birth is associated with increased odds of PPH. If it is due to the way in which labour is managed in hospital, changes should be made to practices which compromise the safety of labouring women.
authors.affiliation: University of Southampton, Southampton, England. andreanove@aol.com
authors.forename: Andrea
authors.initials: A
authors.lastname: Nove
authors.forename: Ann
authors.initials: A
authors.lastname: Berrington
authors.forename: Zoë
authors.initials: Z
authors.lastname: Matthews
mesh_terms: D000293:Adolescent; D000328:Adult; D004739:England / Q000453:epidemiology; D005260:Female; D006700:Home Childbirth / Q000706:statistics & numerical data*; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D016017:Odds Ratio; D057240:Patient Preference / Q000706:statistics & numerical data*; D006473:Postpartum Hemorrhage / Q000453:epidemiology*; D011247:Pregnancy; D055815:Young Adult