Direct standardization is used to compare the mortality rates between two countries.This is done because of:
|A||Cause of death|
- If we want to compare the death rates of two populations with different age-composition, the crude death rate is not the right yardstick. This is because; rates are only comparable if the populations upon which they are based are comparable. And it is cumbersome to use a series of age specific death rates. The answer is "age adjustment" or "age standardization", which removes the confounding effect of different age structures and yields a single standardized or adjusted rate, by which the mortality experience can be compared directly. The adjustment can be made not only for age but also sex, race, parity, etc. Thus one can generate age-sex, and race-adjusted rates.
- Standardization is carried out by one of two methods direct or indirect standardization. Both the methods begin by choosing a "standard population", not the age-structures of the populations.