Abstract
Sex ratios based on a small sample of births tend to be very unstable. It is therefore not surprising that Manning et al. found a relationship between spousal age differences and the sex ratios at birth for a very small sample from a restricted population1. Their findings do not stand up to scrutiny when tested with larger, representative samples of births.
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References
Manning, J. T. et al. Nature 389, 344(1997).
Chahnazarian, A. Social Biol. 35, 214–235 (1991).
Garfinkel, J. & Selvin, S. J. Biosoc. Sci. 8, 113–121 (1976).
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Arnold, F., Rutstein, S., James, W. et al. Sex ratio unaffected by parental age gap. Nature 390, 242–243 (1997). https://doi.org/10.1038/36762
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DOI: https://doi.org/10.1038/36762
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