rate ratio

in epidemiology
initialism: RR
https://doi.org/10.1351/goldbook.14972
Value obtained by dividing the rate in an exposed population by the rate in an unexposed population.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 935 [Terms] [Paper]