Abstract
Valid comparison between tuberculosis mortality rates of different countries has to take stock of the fact that the death-rate from tuberculosis is not the same for the two sexes and of the fact that it is not the same in different age groups. It is, therefore, misleading to compare crude rates, i.e. the annual number of deaths per 1,000 inhabitants. Obviously, a country with a high birth-rate will have a high death-rate from tuberculosis if the tuberculosis death-rate is very high among very young persons (less than 1 year old), albeit the death-rates for separate age groups might not then show any differences at all. To eliminate the source of error inherent in this circumstance, one may use figures for the cumulative risk of dying from tuberculosis, by adding figures for the various age groups. Figures obtained by this means are independent of the age distribution of the population. We may thus follow up 1,000 persons through the course of life and calculate how many die from tuberculosis provided that they do not die for some other reason.
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