Death rates of two countries are best compared by -

.standardised moality ratio is the ratio of total number of deaths that occur in the study group to the number of deaths that would have been expected to occur if that study group had experienced the death rates of a standardised population.it gives a measure of the likely excess risk o moality due to the occupation.it is used to compare the death rates of two countries. ref:park&;s textbook,ed 22,pg no 57