Absolute Risk Reduction Calculator

Calculate Absolute Risk Reduction



Formula

To calculate the Absolute Risk Reduction (ARR):

\[ ARR = CER - EER \]

Where:

Absolute Risk Reduction Definition

An absolute risk reduction is defined as the difference between the percentage rate of a control event and an experimental rate. It represents the decrease in risk of an adverse event due to the intervention being studied, and is often used in clinical trials to evaluate the effectiveness of a treatment.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ ARR = 15\% - 10\% = 5\% \]

The Absolute Risk Reduction is 5%.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ ARR = 20\% - 12\% = 8\% \]

The Absolute Risk Reduction is 8%.