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If you take the age into consideration, whose procedure is called age-adjustment, the mortality rate goes down from 1940 to 1990 dramatically. Age adjustment is to make the outcome of populations, whose composition of age are different, comparable. These slides indicate that the total number of death per unit stayed
same, however, from 1940 to 1990, the longevity became longer, therefore,
less people died in young and middle aged group. So if age-adjustment was
conducted, the mortality went down. |