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Author contributions H.S., A.R.P., and N.G. designed research; H.S., A.R.P., A.L.G., and N.G. performed research; H.S. and A.L.G. analyzed data; and H.S., A.R.P., A.L.G., and N.G. wrote the paper.
Many people made this study possible, including Marie Laure Coubès and Ietza Rocío Bojórquez Chápela, and their colleagues at El COLEF in Tijuana, México, who have collected the EMIF data over many years and provided invaluable advice. Others who have provided help along the way include Mark Handcock [University of California Los Angeles (UCLA)], Maria Elena De Trinidad Young (UC Merced), Josefina Flores Morales (UCLA), Hiram Beltrán Sánchez (UCLA), Boriana Pratt (Princeton University), and Michael Rendall (University of Maryland).
The authors declare no competing interest.
Work on this study was supported by the California Center for Population Research P2C Grant from Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD): P2C-HD041022. Support was also provided by National Institute on Aging (NIA) grant R01AG061094, NICHD grant R00HD096322, and the Russell Sage Foundation.
© 2023 the Author(s). Published by PNAS.