The human sex ratio is the number of males for each female in a population. This is a list of sex ratios by country or region. The table's data is derived from The World Factbook ,  except when otherwise indicated. It shows the male to female sex ratio as estimated by the United States' Central Intelligence Agency. However, there are differences between the estimates by The World Factbook and numbers reported by the census offices of respective countries. For example, The World Factbook in reported Switzerland's sex ratio at birth as 1.
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 below means there are more females than males.
British Broadcasting Corporation Home. More than 24 million Chinese men of marrying age could find themselves without spouses by , says the Chinese Academy of Social Sciences. The gender imbalance among newborns is the most serious demographic problem for the country's population of 1.
Since , the Chinese government through its one-child policy has limited the number of children most citizens can have. One such consequence is an unbalanced sex ratio at birth, with many more boys born in each generation than girls. China recently announced that the National Population and Family Planning Commission would maintain its one-child policy Xinhua News , despite criticism by some experts who maintain that the policy is unnecessary and contributes to population aging and unbalanced sex ratios The Economist The children born immediately after the initiation of the one-child policy are now reaching marriageable ages and inheriting the consequences of the skewed sex ratio at birth. Poston and Glover estimated that in