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In the case of China, because of deficiencies in the vital statistics registration system, studies of sex ratios at birth have relied either on special fertility surveys, whose accuracy depends on full reporting of births and survival of both male and female infants, or on the national population census from which both birth rates and death ...
The other aberration from this otherwise steady decline in teen birth rates is the 6% decrease in birth rates for 15- to 19-year-olds between 2008 and 2009. [99] Despite these years of decrease, U.S. teen birth rates are still higher than in other developed nations. [99] Racial differences prevail with teen birth and pregnancy rates as well.
As of 2024, the global sex ratio at birth is estimated at 107 boys to 100 girls (1,000 boys per 934 girls). [8] By old age, the sex ratio reverses, with 81 older men for every 100 older women; across all ages, the global population is nearly balanced, with 101 males for every 100 females.
The birth rate in major U.S. cities is lower than the national average. Across all locations, the average rate of women aged 15 to 50 having a child in 2022 is 5.2%, compared to 5.0% in major cities.
The table's data is from The World Factbook unless noted otherwise. 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.
The U.S. birth rate has been steadily declining for years, but fairly recently it has tipped over into an alarming category. The estimated “replacement fertility rate,” or the number of births ...
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]
The total (crude) birth rate (which includes all births)—typically indicated as births per 1,000 population—is distinguished from a set of age-specific rates (the number of births per 1,000 persons, or more usually 1,000 females, in each age group). [5]