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=incidence
Relative risk (RR) is calculated as follows:Incidence among the exposed / Incidence among the unexposed; ORa/(a+b) OVER c/(c+d)
example for cumulative incidence(Risk)...... Number of new cases/Population at risk 28 patient in two years/1000 person at risk which means 2.8% the IR for the same example 14 patient / 1 year
# of new cases of a specified disease in a population / population at risk for getting the disease
Yes.We do include vaccinated population from population at risk calculating cumulative incidence.