Publikation: Socioeconomic status and sex ratios at birth in Sweden : No evidence for a Trivers-Willard effect for a wide range of status indicators
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Objectives
This study examines if there exists a positive association between socioeconomic status and the proportion of male births in humans, as proposed by Trivers and Willard in 1973, using individual-level data drawn from the complete population of Sweden.
Methods
We examine more than 3,000,000 births between 1960 and 2007 using administrative register data with comprehensive information on various dimensions of socioeconomic status. We use six different operationalizations of socioeconomic status, including earnings, post-transfer income (including government allowances), wealth, parental wealth, educational level, and occupational class. We apply regression models that compare both changes in status for the same woman over time and differences in status across different women. We also measure socioeconomic status both at the year of child birth and the year of conception.
Results
Our results show the absence of any relationship between socioeconomic status and sex ratios, using a large number of different operationalizations of status.
Conclusions
We conclude that no substantive relationship between socioeconomic status and sex ratios exists for the population and period of our study.
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KOLK, Martin, Sebastian SCHNETTLER, 2016. Socioeconomic status and sex ratios at birth in Sweden : No evidence for a Trivers-Willard effect for a wide range of status indicators. In: American Journal of Human Biology. 2016, 28(1), pp. 67-73. ISSN 1042-0533. eISSN 1520-6300. Available under: doi: 10.1002/ajhb.22756BibTex
@article{Kolk2016Socio-32104,
year={2016},
doi={10.1002/ajhb.22756},
title={Socioeconomic status and sex ratios at birth in Sweden : No evidence for a Trivers-Willard effect for a wide range of status indicators},
number={1},
volume={28},
volume={28},
issn={1042-0533},
journal={American Journal of Human Biology},
pages={67--73},
author={Kolk, Martin and Schnettler, Sebastian}
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<dcterms:abstract xml:lang="eng">Objectives<br /><br />This study examines if there exists a positive association between socioeconomic status and the proportion of male births in humans, as proposed by Trivers and Willard in 1973, using individual-level data drawn from the complete population of Sweden.<br /><br />Methods<br /><br />We examine more than 3,000,000 births between 1960 and 2007 using administrative register data with comprehensive information on various dimensions of socioeconomic status. We use six different operationalizations of socioeconomic status, including earnings, post-transfer income (including government allowances), wealth, parental wealth, educational level, and occupational class. We apply regression models that compare both changes in status for the same woman over time and differences in status across different women. We also measure socioeconomic status both at the year of child birth and the year of conception.<br /><br />Results<br /><br />Our results show the absence of any relationship between socioeconomic status and sex ratios, using a large number of different operationalizations of status.<br /><br />Conclusions<br /><br />We conclude that no substantive relationship between socioeconomic status and sex ratios exists for the population and period of our study.</dcterms:abstract>
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