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Open Access Research article

Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States

Deshayne B Fell1* and KS Joseph2

Author Affiliations

1 Better Outcomes Registry & Network (BORN) Ontario, Children’s Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada

2 Department of Obstetrics and Gynaecology and the School of Population and Public Health, University of British Columbia and the Children’s and Women’s Hospital of British Columbia, Vancouver, BC, Canada

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BMC Pregnancy and Childbirth 2012, 12:103  doi:10.1186/1471-2393-12-103

Published: 27 September 2012

Additional files

Additional file 1:

Figure 1. Temporal trends in rates of twin live births (upper panel) and triplet and higher-order (triplet+) multiple live births (lower panel) in Canada (excluding Ontario), Ontario and the United States, 1991–2009. Plots depict observed rates of twins (per 1,000 live births) and 3-year moving averages of observed rates for triplet+ (per 100,000 live births).

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