12 Apr Among Indian Immigrants to Canada, Female Fetuses Aborted More Commonly than Male
MedicalResearch.com Interview with:
Marcelo L. Urquia PhD
PhD, MSc, Mg Public Health, BA
Scientist, Li Ka Shing Knowledge Institute
St. Michael’s Hospital
Assistant Professor, Dalla Lana School of Public Health, University of Toronto
MedicalResearch.com: What is the background for this study? What are the main findings?
Dr. Urquia: In most populations the sex ratio at birth, that is, ratio of male newborns to female newborns, is about 103 to 107 males per 100 females. This is well established and does not substantially vary according to whether a woman had one or two previous children of the same sex, as each pregnancy is an independent event. However, it is known that several parts of Asia characterize for having son-biased sex ratios at birth. As countries from Asia, such as India and China are the top contributors of births to immigrant women in Canada, we wanted to verify whether son-biased sex ratios were present in Canada. Since induced abortion following prenatal sex determination using ultrasonography has been hypothesized to be a major mechanism that may explain the distorted sex ratios observed in Asia, we also studied the connection between the probability of having boys after induced abortions.
In our first study entitled “Sex ratios after induced abortion” published in CMAJ (http://www.cmaj.ca/lookup/doi/10.1503/cmaj.151074), which used Ontario health care records, we found that sex ratios among Canadian-born women in Ontario were within the expected, irrespective of birth order. The sex ratio among immigrant women from India with two prior girls was 196 males per 100 females for the third live birth. Among Indian immigrant women with two prior daughters the sex ratio increased to 326 males per 100 females if they have had induced abortions preceding the third birth, to 409 males per 100 females if they have had more than one induced abortion since the last newborn child, and to 663 males per 100 females if they have had at least one preceding abortion after 14 weeks of gestation (when the sex of the fetus can be accurately estimated by ultrasonography). These findings suggest that among Indian immigrants to Ontario induced abortions of female fetuses are much more common than induced abortions of male fetuses, which helps explain the deficit in the expected number of female newborns.
In our companion paper entitled “Variations in male-female infant ratios among births toCanadian- and Indian-born mothers, 1990-2011: a population-based register study” and published in CMAJ Open (insert URL), we used national birth certificate data and verified that the patterns observed in Ontario are very likely to apply to all Canadian provinces. Moreover, son-biased sex ratios at birth among Indian immigrants have existed in Canada since the early 1990’s. The deficit in the expected number of girls to Indian immigrants over the last two decades in Canada is in between 3211 to 5921.
MedicalResearch.com: What should clinicians and patients take away from your report?
Dr. Urquia: That among some immigrant families girls may be at disadvantage with respect to boys. Not because there is any biological predisposition among girls but because parents may prioritize boys over girls. The question is whether the female disadvantage observed among fetuses is also present in other key life stages such as infancy, childhood, adolescence and adulthood. In other words, are girls to certain immigrant groups less likely than males to have access to good education, health care and developmental opportunities, in a word, to achieve their human potential as human beings?
MedicalResearch.com: What recommendations do you have for future research as a result of this study?
Dr. Urquia: We still do not know whether son-biased sex ratios at birth are more prevalent among recent immigrants or not. We would expect that after migration immigrants will progressively embrace Canadian values and preference for sons will decrease but we do not have data on this. Likewise, we do not know to what extent these practices exist among second generation Indians (i.e., those born and raised in Canada but to Indian parents).
Future research may ultimately clarify why Indian immigrants in Canada, and perhaps in other countries receiving large numbers of Asian immigrants, after migration continue to exhibit sex ratios at birth as distorted as the sex ratios observed in India, given that they now live in the more gender-egalitarian Canadian society.
MedicalResearch.com: Is there anything else you would like to add?
Dr. Urquia: We hope that the information provided in our studies is used for respectful and open-minded debates on the value of girls and women in Canada and beyond. Although the findings may not be pleasant for some, we need to realize that we have an opportunity to make a difference in the lives of many girls and women at risk of not achieving their human potential.
MedicalResearch.com: Thank you for your contribution to the MedicalResearch.com community.
Sex ratios at birth after induced abortionCMAJ cmaj.151074; published ahead of print April 11, 2016,doi:10.1503/cmaj.151074
, et al
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