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Sex Ratios, Family Size, and Birth Order
American Journal of Epidemiology
In many countries, the male:female ratio at birth has varied significantly over the past century, but the reasons for these changes have been unclear. The authors observed a close parallel between decreasing family size and declining male:female sex ratio in Denmark from 1960 to 1994. To explain this finding, they examined the sex ratio and birth order of 1,403,021 children born to 700,030 couples. Overall, 51.2% of the first births were male. However, families with boys were significantly moredoi:10.1093/oxfordjournals.aje.a010104 pmid:10547141 fatcat:rayzqr5mlzh3nderm44sxgqu2u