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It shows the male to female sex ratio by the Central Intelligence Agency of the United States. If there is a discrepancy between The World Factbook and a country's census data, the latter may be used instead. A ratio above 1, for example 1.1, means there are more males than females (1.1 males for every female).
Sex ratio by country for the population below age 15. Blue represents more boys, red more girls than the world average of 1.07 males/female. Sex ratio by country for total population. Blue represents more men and boys, red more women and girls than the world average of 1.01 males/female. Sex ratio by country for the over-65 population.
The replacement fertility rate is 2.1 births per female for most developed countries (in the United Kingdom, for example), but can be as high as 3.5 in undeveloped countries because of higher mortality rates, especially child mortality. [11]
His argument was summarised by W. D. Hamilton (1967) [3] as follows, assuming that parents invest the same whether raising male or female offspring: Suppose male births are less common than female. A newborn male then has better mating prospects than a newborn female, and therefore can expect to have more offspring.
A 2023 map of countries by fertility rate. Blue indicates negative fertility rates. Red indicates positive rates. The total fertility rate (TFR) of a population is the average number of children that are born to a woman over her lifetime, if they were to experience the exact current age-specific fertility rates (ASFRs) through their lifetime, and they were to live from birth until the end of ...
Crude birth rate refers to the number of births over a given period divided by the person-years lived by the population over that period. It is expressed as number of births per 1,000 population. The article lists 233 countries and territories in crude birth rate. The first list is provided by Population Reference Bureau. [1]
Birth rate: 6.39 births per 1,000 (2023 est.) ... At birth: 1.11 male to female (2020 est.) ... China is the second most populous country in the world and its ...
The following list sorts countries and dependent territories by their net reproduction rate. The net reproduction rate (R 0) is the number of surviving daughters per woman and an important indicator of the population's reproductive rate.