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Statistical Measures

Group of men

Morbidity Frequency Measures

Rate Ratios

Rate Ratio is another tool that is helpful for comparing rates between groups.

A rate ratio compares the rates of disease in two groups that differ by demographic characteristics or exposure history. The rate for the group of primary interest is divided by the rate for a comparison group.

Group of womenRate ratios may be calculated for incidence rates (including attack rates) or for mortality rates, discussed later.