Enter the control event rate and the experimental event rate into the calculator to determine the absolute risk reduction.
Absolute Risk Reduction Formula
The following equation is used to calculate an absolute risk reduction.
ARR = CER – EER
- Where ARR is the absolute risk reduction (%)
- CER is the control even rate (%)
- EER is the experimental event rate (%)
An absolute risk reduction, or ARR for short, is a measure of the absolute difference between a control group and a group receiving a treatment to prevent the event from happening.
An absolute risk is a ratio of the number of people that have a particular event, typically a medical event, compared to the total number of people that it could happen to.
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