Relative Risk Reduction (RRR) is another measure used to quantify the effectiveness of an intervention. While ARR measures the absolute difference in risk, RRR measures the proportional reduction in risk. RRR is calculated as: RRR = (CER - EER) / CER In the previous example, the RRR would be: RRR = (0.2 - 0.1) / 0.2 = 0.1 / 0.2 = 0.5 or 50% This indicates that the treatment reduces the risk of the outcome by 50% relative to the control group. While RRR can sometimes provide a more dramatic representation of the benefit, it is important to consider both RRR and ARR to get a full picture of the intervention's impact.
