What is it about?

Using one million Chinese pregnancies from pre-pregnancy checkup exams, we provide the first documentation of strong and robust evidence of assortative mating by ABO blood type. Compared to random matching, individuals are 5-18% more likely to marry partners with the same blood type (see Table 1 in the paper). The pattern remains when we control for socioeconomic variables such as education, region, and behavior.

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Why is it important?

Assortative mating on blood type could have implications for organ transplants, for example.


The exact reasons for this pattern deserve further exploration. There is a small literature that links blood type to personality, for example.

Professor Hanzhe Zhang
Michigan State University

Read the Original

This page is a summary of: Assortative mating on blood type: Evidence from one million Chinese pregnancies, Proceedings of the National Academy of Sciences, December 2022, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2209643119.
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