The calculation of RR involves comparing the incidence of the disease in the exposed group to the incidence in the unexposed group. Mathematically, it is expressed as:
\[ RR = \frac{Incidence \, in \, Exposed}{Incidence \, in \, Unexposed} \]
Where: - Incidence in Exposed = Number of cases in exposed group / Total number of people in exposed group - Incidence in Unexposed = Number of cases in unexposed group / Total number of people in unexposed group
