What is relative risk reduction?

Relative Risk Reduction

In epidemiology, the relative risk reduction is a measure calculated by dividing the absolute risk reduction by the control event rate.

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Some articles on relative risk reduction:

Relative Risk Reduction - Worked Example
... Example 1 risk reduction Example 2 risk increase Experimental group (E) Control group (C) Total (E) (C) Total Events (E) EE = 15 CE = 115 ... EE = 75 CE = 175 ... Non-even ... Example 1 Example 2 CER − EER < 0 absolute risk reduction ARR (−)0.3, or (−)30% N/A > 0 absolute risk increase ARI N/A 0.1, or 10% (CER − EER) / CER < 0 relative risk reduction RRR (−)0.75, or (−)75 ...

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