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Life expectancy is considered to be the length of survival of a person or a patient. On one hand, this length of survival can be calculated as life expectancy at birth, which represents the number of years an infant is supposed to live throughout his or her life. This information is of importance for political, administrative, and insurance purposes but has less meaning in daily practice for a physician. On the other hand, life expectancy can also be calculated as life expectancy at any time point in the life of a person; this then represents the number of years a person is supposed to live throughout the rest of his or her life. A physician is especially interested in this latter life expectancy, as ...

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