This slide shows the estimated incidence rates for VT for the 4 groups of susceptible and exposed women.

Note - using the method to estimate absolute risk that was illustrated in the previous lecture ‘Absolute, Relative and Attributable Risk’, the incidence rates for VT are almost identical to those estimated by the authors by distributing the person years according to the prevalence of the risk factors. Therefore, this is another approach that can be used to estimate absolute risk (incidence) from a case control study when the overall population incidence rate is known.