Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States
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
BMC Pregnancy and Childbirth 2012, 12:103 doi:10.1186/1471-2393-12-103Published: 27 September 2012
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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