Historically rice-farming societies have tighter social norms in China and worldwide.

Proc Natl Acad Sci U S A · 2020 · PMC7443949 · PMID 32732432

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highly significantno p-value reported

When we pitted all three factors against each other in a single model, population density was no longer significant ( P = 0.698), while GDP and urbanization remained highly significant ( SI Appendix , Table S5 ).

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