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1 results

  • Factors influencing the sex ratio at birth in the United States from a historical perspective

  • Jesús J. Sánchez-Barricarte
  • Journal:
    Journal of Biosocial Science / Volume 55 / Issue 6 / November 2023
    Published online by Cambridge University Press:
    16 January 2023, pp. 1015-1038
    • Article
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  • Many of the studies on the sex ratio at birth (SRB) are based on a small number of cases over a short period of time. Taking a multivariate approach to a dataset consisting of nearly 199 million birth records in the United States from 1968 to 2019, we present a detailed analysis of several possible factors that might affect the sex ratio at birth (SRB) and its patterns of variation. We found that race/ethnicity is the variable with the strongest influence on this index. Parental age, birth order and solar radiation also have a bearing on the SRB, albeit only to a moderate degree. The historical evolution of the SRB among Black and American Indian and Alaska Native populations remains unexplained.