The genetic signature of assortative mating appears to be growing stronger in the United States

Confidence and coverage

Confidence in this analysis: High confidence

Evidence coverage: Substantial coverage

• The underlying individual-level biobank data could not be independently inspected.
• The central study is newly published and its birth-cohort findings have not yet received direct independent replication.
• All of Us is a convenience sample rather than a representative U.S. sample, while UK Biobank is also affected by volunteer-selection bias.

• The complete primary paper and multiple relevant peer-reviewed studies were accessible.
• The article's quantitative statements could be compared directly with the study's methods, results, and limitations.
• Official documentation was available regarding All of Us representativeness.

Sources considered

1. Changing Patterns of Assortative Mating for Educational, Substance Use, and Anthropometric Traits — Primary study; confirms the article's samples, methods, estimates, trends, and stated limitations.
2. Imprint of assortative mating on the human genome — Primary methodological study supporting odd-versus-even chromosome polygenic-score correlations as a measure of accumulated assortment.
3. Parental haplotype reconstruction in up to 440,209 UK and Estonian individuals reveals recent assortative mating dynamics — Supports genetic assortment for education and height but emphasizes that even–odd chromosome methods mainly reflect long-term historical assortment and are relatively insensitive to recent change.
4. Understanding indirect assortative mating and its intergenerational consequences for educational attainment — Shows that educational similarity cannot be reduced to direct selection on education and highlights genetic, environmental, and family-background mechanisms.
5. Evidence of correlations between human partners based on systematic reviews and meta-analyses of 22 traits and UK Biobank analysis of 133 traits — Independently supports strong partner similarity for education and some substance-use traits while documenting substantial between-sample heterogeneity.
6. Genetic similarity between relatives provides evidence on the presence and history of assortative mating — Supports excess trait-specific genetic similarity among relatives and evidence that educational assortment may not be at equilibrium.
7. Does the All of Us cohort offer a representative sample of U.S. citizens? — Officially states that All of Us is a broad convenience sample and its findings are not automatically generalizable.
8. Participation bias in the UK Biobank distorts genetic associations and downstream analyses — Documents selection-related distortion in UK Biobank genetic analyses, especially for education, smoking, diet, and other socio-behavioral traits.