Births
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Fertility
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Crude Birth Rate (CBR) – the number of births
in one year in a country, divided by the country's population, and multiplied
by 1000.
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Fertility rate – Number of live births, divided
by the female population of child bearing age, multiplied by 1000
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Natality – birth as a component of population
change
Deaths
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Mortality
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Crude Death Rate (CDR) – divide the number
of deaths in one year by the population and then multiply by 1000.
Calculating change
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Natural increase = births – deaths
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Growth rate = Natural increase +- net migration
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Doubling time = the amount of time it would
take for a given population to double
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The Rule of 72: 72 ÷ growth rate =
years to double
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example: if a country's growth rate is 3%,
the population will double in about 24 years
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example: if a country's population doubles
in 18 years, its growth rate is about 4%
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History
of world population
Young vs old populations
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If more than 35% of a country's population
is under the age of 15, it is considered a young population
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If more than 15% of a country's population
is over the age of 65, it is considered an old population
Life expectancy
-
The average number of years a person could
expect to live (if current mortality trends continue)
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All Americans: 76.9
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All Males: 74.1
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All Females: 79.5
Demographic Transition
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the shift from high to low levels of both
fertility and mortality
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more info here
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