 Is an additional risk associated with that occupation?To answer the question of whether a population of miners has a higher mortality than we would expect in a similar population that is not engaged in mining, the age-specific rates for such a known population, such as all men of the same age, are applied to each age group in the population of interest.This will yield the number of deaths expected in each age group in the population of interest, if this population had had the mortality experience of the known population.