Attributable Risk Percent Calculator

Formula

The formula to calculate the Attributable Risk Percent (ARP) is:

\[ ARP = \left( \frac{IE - INE}{IE} \right) \times 100 \]

Where:

\( ARP \) is the attributable risk percent (%).
\( IE \) is the incidence in the exposed group.
\( INE \) is the incidence in the non-exposed group.

What is Attributable Risk Percent?

Attributable risk percent (ARP) is a measure used in epidemiology to quantify the proportion of disease or health outcome in the exposed group that can be attributed to the exposure. It is a useful statistic for understanding the public health impact of eliminating a risk factor among a population. ARP is expressed as a percentage, indicating how much of the incidence in the exposed group is due to the exposure compared to the non-exposed group.

Example Calculation

Consider an example where:

Incidence in Exposed Group (IE): 0.05
Incidence in Non-Exposed Group (INE): 0.01

Using the formula to calculate the Attributable Risk Percent:

\[ ARP = \left( \frac{0.05 - 0.01}{0.05} \right) \times 100 = 80 \% \]

This means that the attributable risk percent for this example is 80%.