Journal article
Sex ratios at birth after induced abortion
ML Urquia, R Moineddin, P Jha, PJ O'Campo, K McKenzie, RH Glazier, DA Henry, JG Ray
CMAJ | CMA-CANADIAN MEDICAL ASSOC | Published : 2016
DOI: 10.1503/cmaj.151074
Open access
Abstract
Background: Skewed male:female ratios at birth have been observed among certain immigrant groups. Data on abortion practices that might help to explain these findings are lacking. Methods: We examined 1 220 933 births to women with up to 3 consecutive singleton live births between 1993 and 2012 in Ontario. Records of live births, and induced and spontaneous abortions were linked to Canadian immigration records. We determined associations of male:female infant ratios with maternal birthplace, sex of the previous living sibling(s) and prior spontaneous or induced abortions. Results: Male:female infant ratios did not appreciably depart from the normal range among Canadian-born women and most wo..
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Funding Acknowledgements
The study was funded by a grant from the Canadian Institutes of Health Research (CIHR). Marcelo Urquia holds a CIHR New Investigator Award. Prabhat Jha is supported by a University of Toronto Endowed Chair and a Canada Research Chair. Richard Glazier is supported as a Clinician Scientist in the Department of Family and Community Medicine at the University of Toronto and St. Michael's Hospital. Joel Ray holds a CIHR Chair in Reproductive, Child and Youth Health Services and Policy Research.