A relative risk measures a difference in the probability of a certain outcome between two groups of people - those who were exposed to a risk factor or treatment and those who were not. A statistically significant relative risk indicates that the risk factor is associated with the outcome, and if exposure is randomized as part of a trial it can demonstrate causality.
After selecting Relative risk from the menu, simply enter the number of individuals with each outcome, for both the exposed and unexposed group. Biostats Calculator will calculate the difference between the proportions and perform a hypothesis test to determine whether it is statistically significant.
Biostats Calculator reports: