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Male-biased sex ratios in Australian migrant populations: a population-based study of 1 191 250 births 1999-2015

Edvardsson, Kristina ; Axmon, Anna LU orcid ; Powell, Rhonda and Davey, Mary-Ann (2018) In International Journal of Epidemiology 47(6). p.2025-2037
Abstract

Background: The naturally occurring male-to-female (M/F) ratio at birth is 1.05. Higher ratios found primarily in countries across Asia have been attributed to prenatal sex selection due to son preference. There is growing evidence that sex-selective practices continue following migration; however, little is known about these practices following migration to Australia.

Methods: In this population-based study we assessed M/F ratios at birth per mother's country of birth for all registered births 1999-2015 in Victoria, Australia (n = 1 191 250). We also compared the M/F ratio among births to mothers born elsewhere to that of mothers born in Australia, stratified by time period and parity.

Results: Compared with the naturally... (More)

Background: The naturally occurring male-to-female (M/F) ratio at birth is 1.05. Higher ratios found primarily in countries across Asia have been attributed to prenatal sex selection due to son preference. There is growing evidence that sex-selective practices continue following migration; however, little is known about these practices following migration to Australia.

Methods: In this population-based study we assessed M/F ratios at birth per mother's country of birth for all registered births 1999-2015 in Victoria, Australia (n = 1 191 250). We also compared the M/F ratio among births to mothers born elsewhere to that of mothers born in Australia, stratified by time period and parity.

Results: Compared with the naturally occurring M/F ratio as well as to the M/F ratio among births to mothers born in Australia, there was an increased ratio of male births to mothers born in India, China and South-East Asia, particularly at higher parities and in more recent time periods (elevated M/F ratios ranged from 1·079 to 1·248, relative risks of male birth ranged from 1·012 to 1·084 with confidence intervals between 1·001 and 1·160 and P-values between 0·005 and 0·039). The most male-biased sex ratios were found among multiple births to Indian-born mothers, and parity of two or more births to Indian and Chinese-born mothers in 2011-15.

Conclusions: The male-biased sex ratios observed in this study indicate that prenatal sex selection may be continuing following migration to Australia from countries where these practices have been documented. The excess of males among multiple births raises the question as to what role assisted reproduction plays. Findings also suggest that systematic discrimination against females starts in the womb.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
International Journal of Epidemiology
volume
47
issue
6
pages
2025 - 2037
publisher
Oxford University Press
external identifiers
  • pmid:30052991
  • scopus:85058455889
ISSN
1464-3685
DOI
10.1093/ije/dyy148
language
English
LU publication?
yes
id
cfa37a3f-5733-4a4f-ad4b-f17e01026fdb
date added to LUP
2018-07-31 08:10:59
date last changed
2021-09-15 04:37:18
@article{cfa37a3f-5733-4a4f-ad4b-f17e01026fdb,
  abstract     = {<p>Background: The naturally occurring male-to-female (M/F) ratio at birth is 1.05. Higher ratios found primarily in countries across Asia have been attributed to prenatal sex selection due to son preference. There is growing evidence that sex-selective practices continue following migration; however, little is known about these practices following migration to Australia.</p><p>Methods: In this population-based study we assessed M/F ratios at birth per mother's country of birth for all registered births 1999-2015 in Victoria, Australia (n = 1 191 250). We also compared the M/F ratio among births to mothers born elsewhere to that of mothers born in Australia, stratified by time period and parity.</p><p>Results: Compared with the naturally occurring M/F ratio as well as to the M/F ratio among births to mothers born in Australia, there was an increased ratio of male births to mothers born in India, China and South-East Asia, particularly at higher parities and in more recent time periods (elevated M/F ratios ranged from 1·079 to 1·248, relative risks of male birth ranged from 1·012 to 1·084 with confidence intervals between 1·001 and 1·160 and P-values between 0·005 and 0·039). The most male-biased sex ratios were found among multiple births to Indian-born mothers, and parity of two or more births to Indian and Chinese-born mothers in 2011-15.</p><p>Conclusions: The male-biased sex ratios observed in this study indicate that prenatal sex selection may be continuing following migration to Australia from countries where these practices have been documented. The excess of males among multiple births raises the question as to what role assisted reproduction plays. Findings also suggest that systematic discrimination against females starts in the womb.</p>},
  author       = {Edvardsson, Kristina and Axmon, Anna and Powell, Rhonda and Davey, Mary-Ann},
  issn         = {1464-3685},
  language     = {eng},
  month        = {07},
  number       = {6},
  pages        = {2025--2037},
  publisher    = {Oxford University Press},
  series       = {International Journal of Epidemiology},
  title        = {Male-biased sex ratios in Australian migrant populations: a population-based study of 1 191 250 births 1999-2015},
  url          = {http://dx.doi.org/10.1093/ije/dyy148},
  doi          = {10.1093/ije/dyy148},
  volume       = {47},
  year         = {2018},
}