| Title |
Sex ratios at birth after induced abortion
|
|---|---|
| Published in |
Canadian Medical Association Journal, April 2016
|
| DOI | 10.1503/cmaj.151074 |
| Pubmed ID | |
| Authors |
Marcelo L. Urquia, Rahim Moineddin, Prabhat Jha, Patricia J. O’Campo, Kwame McKenzie, Richard H. Glazier, David A. Henry, Joel G. Ray |
| Abstract |
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. 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. Male:female infant ratios did not appreciably depart from the normal range among Canadian-born women and most women born outside of Canada, irrespective of the sex of previous children or the characteristics of prior abortions. However, among infants of women who immigrated from India and had previously given birth to 2 girls, the overall male:female ratio was 1.96 (95% confidence interval [CI] 1.75-2.21) for the third live birth. The male:female infant ratio after 2 girls was 1.77 (95% CI 1.26-2.47) times higher if the current birth was preceded by 1 induced abortion, 2.38 (95% CI 1.44-3.94) times higher if preceded by 2 or more induced abortions and 3.88 (95% CI 2.02-7.50) times higher if the induced abortion was performed at 15 weeks or more gestation relative to no preceding abortion. Spontaneous abortions were not associated with male-biased sex ratios in subsequent births. High male:female ratios observed among infants born to women who immigrated from India are associated with induced abortions, especially in the second trimester of pregnancy. |
X Demographics
The data shown below were collected from the profiles of 184 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Canada | 67 | 36% |
| United States | 6 | 3% |
| United Kingdom | 3 | 2% |
| India | 2 | 1% |
| Israel | 2 | 1% |
| Comoros | 1 | <1% |
| New Zealand | 1 | <1% |
| Argentina | 1 | <1% |
| Germany | 1 | <1% |
| Other | 0 | 0% |
| Unknown | 100 | 54% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 167 | 91% |
| Scientists | 8 | 4% |
| Science communicators (journalists, bloggers, editors) | 6 | 3% |
| Practitioners (doctors, other healthcare professionals) | 3 | 2% |
Mendeley readers
The data shown below were compiled from readership statistics for 76 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 76 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Postgraduate | 11 | 14% |
| Student > Bachelor | 10 | 13% |
| Student > Master | 9 | 12% |
| Researcher | 6 | 8% |
| Student > Ph. D. Student | 6 | 8% |
| Other | 16 | 21% |
| Unknown | 18 | 24% |
| Readers by discipline | Count | As % |
|---|---|---|
| Nursing and Health Professions | 13 | 17% |
| Medicine and Dentistry | 13 | 17% |
| Social Sciences | 6 | 8% |
| Biochemistry, Genetics and Molecular Biology | 5 | 7% |
| Psychology | 5 | 7% |
| Other | 14 | 18% |
| Unknown | 20 | 26% |
Attention Score in Context
This research output has an Altmetric Attention Score of 326. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 02 April 2024.
All research outputs
#104,453
of 25,765,370 outputs
Outputs from Canadian Medical Association Journal
#194
of 9,550 outputs
Outputs of similar age
#1,978
of 317,263 outputs
Outputs of similar age from Canadian Medical Association Journal
#5
of 105 outputs
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