Enter the incidence risk among both the exposed and non-exposed groups into the calculator to determine the attributable risk.

Attributable Risk Formula

The following formula can be used to calculate the attributable risk. 

AR = I_e - I_u
  • Where AR is the attributable risk
  • Ie is the incidence rate in the exposed group
  • Iu is the incidence rate in the non-exposed group

To calculate the attributable risk, subtract the incidence rate in the non-exposed group from the rate in the exposed group.

Attributable Risk Definition

Attributable risk is the difference between the incidence rate in an exposed group to a non-exposed group.

Attributable Risk Example

How to calculate attributable risk?

  1. First, determine the incidence rate in the exposed group.

    Measure the incidence rate in the exposed group.

  2. Next, determine the incidence rate in the non-exposed group.

    Measure the incidence rate in the non-exposed group.

  3. Finally, calculate the attributable risk.

    Using the formula above, calculate the attributable risk.

FAQ

What is an attributable risk?

The definition of the attributable risk is as follows: a measure of the prevalence of a disease within a group.