# Absolute Risk Reduction

Also found in: Acronyms, Wikipedia.

## Absolute Risk Reduction

Epidemiology A measure of the treatment effect, comparing the probability—or mean of a type of outcome in the control group—with that of a treatment group.EBM The absolute arithmetic difference in the risk—i.e., the rate of an adverse event or outcome—between a study (treated/experimental) population and a control population.

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