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A period life table uses a hypothetical population with conventional age groupings with the death case data from census records for a specified period of time, usually a year.
A cohort life table uses a specific (real) population from a defined region with conventional age groupings with death case data from death certificates from that region during the period specified.
Both are referred to as Life Tables, unfortunately.
A period life table provides life expectancy based on mortality rates at a specific point in time, while a cohort life table follows a specific group of individuals from birth to death, providing a more accurate measure of life expectancy for that cohort. Period life tables are frequently updated and more readily available, while cohort life tables give a more accurate representation of longevity for a specific group.
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chut
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