# Relative risk

The ratio of the incidence rate or the mortality rate from the disease of interest such as cancer in an exposed population to that in an unexposed population.

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## Previous glossary entries

### from ICRP Publication 131, 2015

An expression of overall risk (i.e. including the radiation-induced risk) relative to the underlying baseline risk. If the total risk is twice the underlying baseline risk, the RR is 2.

### from ICRP Publication 126, 2014

The ratio of the incidence rate or the mortality rate from the disease of interest (i.e. lung cancer) in an exposed population to that in an unexposed population.

### from ICRP Publication 118, 2012

An expression of risk relative to the underlying baseline risk. If the total risk is twice the underlying baseline risk, the relative risk is 2.

### from ICRP Publication 115, 2010

The ratio of the incidence rate or the mortality rate from the disease of interest (e.g. lung cancer) in an exposed population to that in an unexposed population.