Abstract
WE present here evidence suggesting the existence of at least two kinds of factors affecting the human sex ratio. As the sex ratio we use the number of male births per 100 female births. The evidence is based on family data collected by Geissler1 in 1889 and by ourselves2,3.
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References
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RENKONEN, K., MÄKELÄ, O. & LEHTOVAARA, R. Factors affecting the Human Sex Ratio. Nature 194, 308–309 (1962). https://doi.org/10.1038/194308b0
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DOI: https://doi.org/10.1038/194308b0
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