title: Factors associated with maternal morbidity in the Term Breech Trial.
abstract: OBJECTIVE
  In the Term Breech Trial, the risk of maternal morbidity in women who delivered after planning for a caesarean section (CS) was not significantly different from those who delivered after planning for a vaginal birth. We undertook secondary analyses to determine factors associated with maternal morbidity among 2078 women.
  
  
  METHODS
  By using multiple logistic regression analyses, we determined the effect of prelabour CS, CS during early labour, CS during active labour, vaginal birth, and other factors on maternal morbidity. For 1536 women delivered after labour, we determined the effect of variables associated with labour on maternal morbidity.
  
  
  RESULTS
  The risk of maternal morbidity was lowest following vaginal birth (odds ratio [OR] 1.0) and highest following CS during active labour (OR 3.33; 95% confidence intervals [CI] 1.75-6.33, P < 0.001). For those delivered after labour, a short active phase of the second stage of labour (< 30 minutes) was associated with the lowest risk of maternal morbidity (OR 0.25; 95% CI 0.11-0.57, P < 0.001).
  
  
  CONCLUSIONS
  For women with a singleton fetus in breech resentation at term, maternal morbidity is lowest following vaginal birth and highest following CS during active labour.
authors.affiliation: Department of Obstetrics and Gynaecology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON.
authors.forename: Min
authors.initials: M
authors.lastname: Su
authors.affiliation: Department of Obstetrics and Gynaecology, IWK Health Centre, Dalhousie University, Halifax, NS.
authors.forename: Lynne
authors.initials: L
authors.lastname: McLeod
authors.affiliation: Department of Obstetrics and Gynaecology, University of Calgary, Calgary, AB.
authors.forename: Sue
authors.initials: S
authors.lastname: Ross
authors.affiliation: Department of Public Health Sciences, University of Toronto, Toronto, ON.
authors.forename: Andrew
authors.initials: A
authors.lastname: Willan
authors.affiliation: Department of Obstetrics and Gynaecology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON.
authors.forename: Walter J
authors.initials: WJ
authors.lastname: Hannah
authors.affiliation: Department of Family Practice, Division of Midwifery, University of British Columbia, Vancouver, BC.
authors.forename: Eileen K
authors.initials: EK
authors.lastname: Hutton
authors.affiliation: University of Toronto, Maternal Infant and Reproductive Health Research Unit, Women's College Research Institute, Toronto, ON.
authors.forename: Sheila A
authors.initials: SA
authors.lastname: Hewson
authors.affiliation: University of Toronto, Maternal Infant and Reproductive Health Research Unit, Women's College Research Institute, Toronto, ON.
authors.forename: Darren
authors.initials: D
authors.lastname: McKay
authors.affiliation: Department of Obstetrics and Gynaecology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON.
authors.forename: Mary E
authors.initials: ME
authors.lastname: Hannah
mesh_terms: D000328:Adult; D001946:Breech Presentation; D002170:Canada / Q000453:epidemiology; D002585:Cesarean Section / Q000009:adverse effects / Q000706:statistics & numerical data; D036861:Delivery, Obstetric / Q000009:adverse effects / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D017063:Outcome Assessment, Health Care; D011247:Pregnancy; D011644:Puerperal Disorders / Q000453:epidemiology* / Q000209:etiology / Q000517:prevention & control; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors