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These studies suggest that the human sex ratio, both at birth and as a population matures, can vary significantly according to a large number of factors, such as paternal age, maternal age, plural birth, birth order, gestation weeks, race, parent's health history, and parent's psychological stress.
It has been proposed that these environmental factors also explain sex differences in mortality.In the United States, the sex ratios at birth over the period 1970–2002 were 1.05 for the white non-Hispanic population, 1.04 for Mexican Americans, 1.03 for African Americans and Indians, and 1.07 for mothers of Chinese or Filipino ethnicity.There is controversy whether sex ratios outside the 103-107 range are due to sex-selection, as suggested by some scholars, or due to natural causes.Human sex ratios, either at birth or in the population as a whole, are reported in any of four ways: the ratio of males to females, the ratio of females to males, the proportion of males, or the proportion of females.If there are 108,000 males and 100,000 females the ratio of males to females is 1.080 and the proportion of males is 51.9%.Scientific literature often uses the proportion of males.
This article uses the ratio of males to females, unless specified otherwise.
Some scholars suggest that countries considered to have significant practices of prenatal sex-selection are those with birth sex ratios of 108 and above (selection against females) and 102 and below (selection against males).
This assumption has been questioned by some scholars.
Like most sexual species, the sex ratio in humans is approximately 1:1.
Due to higher female fetal mortality, war casualties, sex-selective abortions, infanticides, aging, and deliberate gendercide.
In economically developed countries, as well as developing countries, these scientific studies have found that the human sex ratio at birth has historically varied between 0.94 and 1.15 for natural reasons.