Risk (relative) - the probability, used to show the possibility of disease development in two different groups of people. If the data above is used, the probability of an individual falling ill is 10%. If the relative probability is 2, it means that the possibility of the second group falling ill is 2 times greater than the possibility of the first group. The second group will thus have twice the number of the diseased, i.e. 20%, which means that 6 out of every 30 people will fall ill.