Figure 2. Relative risks and frequency of risk factors assuming a PAR of 30%.

Relative risks are calculated depending on the frequency of the risk factor in the population assuming a population attributable risk (PAR) of 30%, corresponding to the supposed PAR of genetic risk factors for UBC. Given a PAR of 30%, the relative risk does not fall below 1.43 if the frequency of the risk factor is present in almost the entire population.