Risk Difference Calculator

Formula

The formula to calculate the Risk Difference (Rd) is:

\[ \text{Rd} = \text{CIe} - \text{CIn} \]

Where:

\( \text{Rd} \) is the Risk Difference
\( \text{CIe} \) is the Cumulative Incidence of the Exposed Group
\( \text{CIn} \) is the Cumulative Incidence of the Non-Exposed Group

Risk Difference Definition

A risk difference is the total difference between the incidence rates of a group of people exposed to a disease when compared to those not exposed, usually considered the control group.

Example Calculation

Let's consider an example:

Cumulative Incidence of Exposed Group (CIe): 0.15
Cumulative Incidence of Non-Exposed Group (CIn): 0.05

Using the formula to calculate the Risk Difference:

\[ \text{Rd} = 0.15 - 0.05 = 0.10 \]

This demonstrates that with a cumulative incidence of 0.15 for the exposed group and 0.05 for the non-exposed group, the risk difference would be 0.10.