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Excess relative risk

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The rate of disease in an exposed population divided by the rate of disease in an unexposed population, minus 1.0. This is often expressed as the excess relative risk per Gy or per Sv.

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from ICRP Publication 131, 2015

The excess proportion (or percentage) of the rate of radiation-induced disease in an exposed population divided by the rate of disease in an unexposed population that has the same background risk factors (age, sex, race, etc.). This is often expressed as ERR per Gy or per Sv.

from ICRP Publication 115, 2010

The rate of disease in an exposed population divided by the rate of disease in an unexposed population, minus 1. When studying a dose–response relationship, this is expressed as the excess relative risk per Gy or per Sv: (Relative risk - 1)/unit of exposure.

from ICRP Publication 103, 2007 & ICRP Publication 118, 2010

The rate of disease in an exposed population divided by the rate of disease in an unexposed population, minus 1.0. This is often expressed as the excess relative risk per Gy or per Sv.