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The ratio between the number of males and females in a society is referred to as the gender ratio.This ratio is not stable but instead shaped by biological, social, technological, cultural, and economic forces.

Why are births naturally expected to be male-biased?

(2015) monitored the trajectory of sex ratio from conception through to birth across five different methods.

This produced the largest dataset available on the sex ratio throughout the stages of pregnancy.

For most countries, there are around 105 males per 100 female births.

This is what the World Health Organization (WHO) estimates as the 'expected' sex ratio at birth: in the absence of gender discrimination or interference we'd expect there to be around 105 boys born per 100 girls, although this can range from around 103 to 107 boys per 100 girls. In the most comprehensive study of its kind, Orzack et al.

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