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Researchers use skull CT scans to estimate assigned sex at birth

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Human sex ratios, either at birth or in the population as a whole, can be reported in any of four ways: the ratio of males to females, the ratio of females to males, the proportion of males, or the proportion of females.

  • Various metric measurements of the skull were collected using a 3D measuring tool between 18 standard points of measurement of the cranium and mandible largest bone in the skull.

  • None of the natural factors such as paternal age, maternal age, age difference of parents, birth order could explain the time trends.

  • Mémoires de l'Académie royale des sciences de Paris.

Human sex ratio

Second, there is pressure for women to give birth to sons, often because of cultural preferences for male heirs.

  • Some scholars argue that strong socioeconomic factors such as the and the of China are responsible for prenatal sex selection.

  • These chemicals are believed to have accumulated in the tissues of fish and animals that make up the bulk of these populations' diets.

  • They find an increased excess of male births during periods of exogenous stress World War II and during warm years.




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