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The period life expectancy is the number of years that a person of a selected age is expected to live under the assumption that the mortality rates on which the life table is based will not change in the future. The period life table is a table showing how many out of 100 thousand newborns will reach the age of 0 to 1, 2 etc., based on the mortality ratios that have actually been observed over a certain period. The mortality rate means the probability of death before reaching the next age. The probability of death is calculated as the observed number of deaths in the selected period per 100 thousand of the average (real) population of equal age and sex.