In epidemiology, the relative risk reduction (RRR) or efficacy is the relative decrease in the risk of an adverse event in the exposed group compared to an unexposed group.

Relative risk reduction (RRR) tells you by how much the treatment reduced the risk of bad outcomes relative to the control group who did not have the treatment.

Guide to the Relative Risk Reduction Formula. Here we discuss how to calculate RRR along with examples and a downloadable excel template.

Learn how to calculate and interpret relative vs absolute risk, risk reduction, and the number needed to treat.

Calculations of relative risk (RR) and relative risk reduction (RRR) are specific to the sampled groups under study whereas absolute risk (AR) and absolute risk reduction (ARR) pertain to …

May 25, 2025 · What is Relative Risk Reduction? Relative Risk Reduction (RRR) is a measure used in epidemiology to assess the effectiveness of an intervention or treatment in reducing …

Oct 27, 2020 · Relative Risk Reduction (RRR) is a term used in epidemiology to define the relative decrease in the risk of an adverse event (contracting a disease or other attributes) in …

Jun 25, 2025 · Relative risk equal to one means there was no different in the risk between the two groups. Relative Risk Reduction tells you by how much the treatment reduced the risk of bad …

Relative risk reduction (RRR) is defined as the percentage difference in risk or outcomes between treatment and control groups, calculated by the formula (risk in control group - risk in treatment …

RRR is the proportional amount that a risk is decreased in 1 group versus another. Numerically, it is the control group event rate (CER) minus the experimental group event rate (EER) divided …