In epidemiology, a ratio obtained by dividing the incidence rate of one group by the incidence rate of a second group.
A measure of the likelihood of developing a disease for people who are exposed to a particular risk, relative to people who are not exposed to the same risk. For example, the relative risk of myocardial infarction for oral contraceptive users is 1.6 times that of non-users.
The difference in incidence rate between exposed and unexposed populations, expressed in relative terms. It can be calculated as the incidence rate in the exposed group (II) divided by the incidence rate in the unexposed group (10). Also known as rate ratio. A relative risk of 1 indicates that the disease is not related to exposure (II = 10).
In epidemiological studies, the relative amount of disease occurring in different populations; the ratio of incidence rate in the exposed group to that in the unexposed group.