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Crude rates are those calculated for an entire population, such as the annual cancer mortality rate. Category specific rates are based on the number of persons in the category and the number of cases occurring in that group, such as the age-specific cancer death rate. Age adjustment allows for more appropriate comparisons when differences in age distribution in the two populations may mask real differences in the condition of interest. Rates imply a change over time. For disease incidence rates, the change is from a healthy state to disease for a specified period of time.
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