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  2. Natality in population ecology - Wikipedia

    en.wikipedia.org/wiki/Natality_in_population_ecology

    Natality is shown as a crude birth rate or specific birth rate. Crude birth rate is used when calculating population size (number of births per 1000 population/year), whereas specific birth rate is used relative to a specific criterion such as age. By calculating specific birth rate, the results are seen in an age-specific schedule of births.

  3. Birth rate - Wikipedia

    en.wikipedia.org/wiki/Birth_rate

    The other aberration from this otherwise-steady decline in teen birth rates is the six percent decrease in birth rates for 15- to 19-year-olds between 2008 and 2009. [65] Despite the decrease, U.S. teen birth rates remain higher than those in other developed nations. [ 65 ]

  4. List of countries by rate of natural increase - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_rate...

    Rates are the average annual number of births or deaths during a year per 1,000 persons; these are also known as crude birth or death rates. Column four is from the UN Population Division [3] and shows a projection for the average natural increase rate for the time period shown using the medium fertility variant. Blank cells in column four ...

  5. List of countries by birth rate - Wikipedia

    en.wikipedia.org/.../List_of_countries_by_birth_rate

    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]

  6. How a Declining Birth Rate Will Affect Social Security and ...

    www.aol.com/declining-birth-rate-affect-social...

    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 ...

  7. Fertility - Wikipedia

    en.wikipedia.org/wiki/Fertility

    Crude birth rate (CBR) - the number of live births in a given year per 1,000 people alive at the middle of that year. One disadvantage of this indicator is that it is influenced by the age structure of the population. General fertility rate (GFR) - the number of births in a year divided by the number of women aged 15–44, times 1000. It ...

  8. Total fertility rate - Wikipedia

    en.wikipedia.org/wiki/Total_fertility_rate

    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 ...

  9. What's Causing America's Birth Rate To Be Lower Than Ever? - AOL

    www.aol.com/whats-causing-americas-birth-rate...

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