Effect of Fertility on Secondary Sex Ratio and Twinning Rate in Sweden, 1749–1870

@article{Fellman2014EffectOF,
  title={Effect of Fertility on Secondary Sex Ratio and Twinning Rate in Sweden, 1749–1870},
  author={Johan Fellman and Aldur W. Eriksson},
  journal={Twin Research and Human Genetics},
  year={2014},
  volume={18},
  pages={92 - 99}
}
We analyzed the effect of total fertility rate (TFR) and crude birth rate (CBR) on the number of males per 100 females at birth, also called the secondary sex ratio (SR), and on the twinning rate (TWR). Earlier studies have noted regional variations in TWR and racial differences in the SR. Statistical analyses have shown that comparisons between SRs demand large data sets because random fluctuations in moderate data are marked. Consequently, reliable results presuppose national birth data. Here… 
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Methods Citations
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Citation Type

Geographic Variation in Fertility Measures in Sweden in (1749 - 1870)
TLDR
No common spatial pattern for the demographic variables SR, TFR, CBR and TWR was detected, but a better fit was noted for T FR,CBR and TwR than for SR.
Temporal and regional trends in the secondary sex ratio: The Nordic experience.
Glimpses at the History of Sex Ratio Studies
The sex ratio at birth (SR) is defined as the number of males per 100 females and is almost always around 106. John Graunt (1620–1674) was the first to compile data showing an excess of male births…

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