There are two primary methods for calculating age standardized rates: the direct method and the indirect method.
Direct Method: This involves applying the age-specific rates of the population under study to a standard age distribution. The sum of these products gives the age-standardized rate. Indirect Method: This method involves applying the age-specific rates from a standard population to the age distribution of the population under study. This is commonly used when age-specific rates of the study population are unreliable or unavailable.
