Sex ratios reflect the two basic regularities of human demographics: 1 there are always more boys being born; 2 males experience higher mortality throughout their life-course. The sex ratio at birth does not vary dramatically 1 and is more or less constant at the level of boys per girls. Hence, differences in the sex ratio profiles of countries mainly reflect gender gap in mortality. In this post I will compare sex ratios age profiles in all countries included in Human Mortality Database. R gives amazing opportunities to grab data fast and easy. It lists the codes for all countries in HMD.
China Age structure
Little China girls: how history's worst famine shifted the sex ratio
The first list is based on the projection by United Nations for year This list include sex ratio of countries and regions. Data of is taken for as data in United Nations are available for 5 year gap Second list is based on the estimates by the World bank for year The human sex ratio is the number of males for each female in a population. Sex ratio above means there are more males than females.
Sex ratio in China 1953-2017
Population figures are estimates by Countrymeters countrymeters. During China population is projected to increased by 7,, people and reach 1,,, in the beginning of The natural increase is expected to be positive, as the number of births will exceed the number of deaths by 7,,
In the human species the ratio between males and females at birth is slightly biased towards the male sex. This means that at birth on average, there are males for every females. Nature provides that the number of newborn males slightly outnumber newborn females because as they grow up, men are at a higher risk of dying than women not only due to sex differentials in natural death rates, but also due to higher risk from external causes accidents, injuries, violence, war casualties. Thus, the sex ratio of total population is expected to equalize.