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To use direct standardisation you need to know:
(1) the age-specific disease rates in your study population and
(2) the age distribution of the standard population
An example: standardising the IHD mortality rate for males in Germany to the world standard population
See Table 1. You first multiply each age-specific rate (Column D) by the number of people in that age group in the standard population (Column E) to calculate the number of events that you would expect to see in the standard population if it had the same rates as your study population (Column F).
You then divide the total number of events expected (the total of column F) by the total number of people in the standard population (the total of Column E) to calculate the standardised rate.
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