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Temporal trends in maternal mortality in Canada II: estimates based on hospitalization data
Sarka Lisonkova1, Shiliang Liu, Sharon Bartholomew
1Department of Obstetrics and Gynaecology, University of British Columbia and the Children's and Women's Hospital of British Columbia, Vancouver BC.
Journal of Obstetrics and Gynaecology Canada : JOGC = Journal D'Obstetrique Et Gynecologie Du Canada : JOGC
|October 22, 2011
Summary
Canadian maternal mortality rates remained stable from 1996-2007, contrary to Vital Statistics data. Hospitalization data offer a reliable method for tracking maternal death trends.
Area of Science:
- Public Health
- Epidemiology
- Maternal Health
Background:
- Canadian Vital Statistics data indicated a rise in maternal mortality rates.
- Vital Statistics data may provide inaccurate maternal mortality estimates.
- Hospitalization data offer an alternative for monitoring maternal mortality trends.
Purpose of the Study:
- To examine temporal trends in maternal mortality in Canada.
- To assess the accuracy of hospitalization data for monitoring maternal mortality.
Main Methods:
- In-hospital maternal deaths (ages 15-54) were identified using Canadian Institute for Health Information hospitalization data (1996-2007).
- Maternal deaths were classified as delivery-related or linked to prior pregnancy hospitalizations.
- Maternal mortality rates, confidence intervals, and risk ratios were calculated.
Main Results:
- Maternal mortality rates showed no significant trend, remaining around 9.0-9.2 per 100,000 deliveries (1996-2007).
- Risk factors included advanced maternal age, Caesarean section, and early gestation delivery.
- Cardiovascular diseases were the leading cause of maternal death; late maternal deaths accounted for 5.4 per 100,000 deliveries.
Conclusions:
- No increase in maternal mortality was observed in Canada between 1996 and 2007.
- Observed increases in Vital Statistics data likely stem from improved death ascertainment.
- Canadian hospitalization data are a valuable, timely resource for monitoring maternal mortality.
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