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・ List of countries by rail transport network size
・ List of countries by ratio of GDP to carbon dioxide emissions
・ List of countries by real GDP growth rate
・ List of countries by real population density based on food growing capacity
・ List of countries by received FDI
・ List of countries by received FDI in the past
・ List of countries by recoverable shale gas
・ List of countries by refined petroleum exports
・ List of countries by refugee population
・ List of countries by research and development spending
・ List of countries by risk of death from non-communicable disease
・ List of countries by road network size
・ List of countries by salt production
・ List of countries by sector composition of the labor force
・ List of countries by Sen social welfare function
List of countries by sex ratio
・ List of countries by ship exports
・ List of countries by silicon production
・ List of countries by silver production
・ List of countries by smartphone penetration
・ List of countries by Social Progress Index
・ List of countries by southernmost point
・ List of countries by sovereign wealth funds
・ List of countries by spending on education (% of GDP)
・ List of countries by spoken languages
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List of countries by sex ratio : ウィキペディア英語版
List of countries by sex ratio

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.
== Methodology ==
The table actually represents ''The World Factbook'',〔"(Sex Ratio )", '' The World Factbook'', Central Intelligence Agency, ''accessed various dates''.〕 except when otherwise indicated. It shows the male to female sex ratio as estimated by United States' CIA. However, there are differences between the estimates by ''The World Factbook'' and numbers reported by the census offices of respective countries. The world average for the ratio of males/females is 1.01, which means there are (more) 1.01 males for (lesser) 1.00 females.
For example, ''The World Factbook'' in 2001 reported Switzerland's sex ratio at birth as 1.05,〔(【引用サイトリンク】url=https://www.cia.gov/library/publications/the-world-factbook/geos/sz.html )〕 while Switzerland's Federal Office of Statistics in 2011 reported Switzerland's sex ratio at birth as 1.07 per its birth records census data.〔(【引用サイトリンク】 url=http://www.bfs.admin.ch/bfs/portal/en/index/themen/00/01/blank/02.html )〕 Similar differences between estimates by "The World Factbook" and census numbers from birth records are known for Sweden, Norway, Ireland, India and Japan.
A ratio above 1, e.g. 1.1, means there are 1.1 males for every 1 female (more males than females). A ratio below 1, e.g. 0.8, means there are 0.8 males for every 1 female (more females than males). A ratio of 1 means there are equal numbers of females and males.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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