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Arias and her colleagues calculated life expectancy using a technique called a period life table.

Ms. Zarr added that a police report was filed against a male student who walked up to the Students for Life table, grabbed all of its information booklets, and ran off before throwing them in a gutter.

Developing a comprehensive life table will show the trajectory of a population.

I have attached a spreadsheet that uses the same Social Security life table you may have used for your column.

Life table data does not go back to the 18th century, Dr. Jena said, so his team estimated comparable life expectancies based on early 19th-century data.