ArticleCMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne2016
Sex ratios at birth after induced abortion.
Article in CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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20 citing papers in PubMed.
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- Disparities in Child Development by Maternal Birthplace and Child Sex among Kindergarten Children in Manitoba, Canada: A Population-Based Data Linkage Study.Journal of immigrant and minority health · 2025Article
- Procedural abortion, provider-initiated preterm delivery and survival in pregnant people with cancer: A population-based cohort study.BJOG : an international journal of obstetrics and gynaecology · 2025Article
- Indirect evidence of sex-selective abortion practices to the imbalanced sex ratio at birth in Australian migrant populations.PLOS global public health · 2025Article
- Regulating Personal Ultrasound Use Is Moot in 21st Century when Self-Identified Gender Will Be Self-Determined Way after Birth, Whereafter Future Procreation Will Be Further Self-Limited by Self-Determined Fertility.Annals of cardiac anaesthesia · 2024Article
- Article
- Incidence of Pregnancy-Associated Cancer in Two Canadian Provinces: A Population-Based Study.International journal of environmental research and public health · 2021Article
- Article
- Induced abortion according to immigrants' birthplace: a population-based cohort study.Reproductive health · 2020Article
- Article
- Sex selection and non-invasive prenatal testing: A review of current practices, evidence, and ethical issues.Prenatal diagnosis · 2020Review
- Missing girls among deliveries from Indian and Chinese mothers in Spain 2007-2015.European journal of epidemiology · 2019Article
- Male-biased sex ratios in Australian migrant populations: a population-based study of 1 191 250 births 1999-2015.International journal of epidemiology · 2018Article
- Sex ratios at birth among second-generation mothers of South Asian ethnicity in Ontario, Canada: a retrospective population-based cohort study.Journal of epidemiology and community health · 2018Article
- Interventions to reduce adverse health outcomes resulting from manifestations of gender bias amongst immigrant populations: a scoping review.BMC women's health · 2018Article
- Intergenerational abortion tendency between mothers and teenage daughters: a population-based cohort study.CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2018Article
- Are we consistent?CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2016Article
- Male-biased infant sex ratios and patterns of induced abortion.CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne · 2016Article
- Infant mortality among the Canadian-born offspring of immigrants and non-immigrants in Canada: a population-based study.Population health metrics · 2016Article
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Abstract
backgroundSkewed 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.
methodsWe 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.
resultsMale: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.
interpretationHigh 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.
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