Category:Adolescent boys
Category:Adolescent boys
A woman cleans a boy's face in Wuhan, in Hubei province on January... Foto jornalística
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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.
Switzerland Federal Statistics Office.
They studied the birth records to identify the effects of multiple birth, birth order, age of parents and the sexes of preceding siblings on the proportion of males using contingency tables, and regression analysis.
Like most Asian nations, China has a traditional bias for sons and decades of a one-child policy has led to what some people see as a tendency for parents to molly-coddle their boys.
Some of the factors suggested as causes of the gender imbalance are sex-selective abortion and infanticide, large-scale migration, and behavioral factors statistically linked with sex, such as excessive drinking and violence.
Human sex at birth was also analyzed and used as an example by 1713 , where an unequal sex ratio is a natural example of a with uneven odds.