<Tr> <Th> Smoker </Th> <Td> a (\ displaystyle a) </Td> <Td> b (\ displaystyle b) </Td> </Tr> <Tr> <Th> Non-smoker </Th> <Td> c (\ displaystyle c) </Td> <Td> d (\ displaystyle d) </Td> </Tr> <P> Consider an example where the probability of developing lung cancer among smokers was 20% and among non-smokers 1% . This situation is expressed in the 2 × 2 table to the right . </P> <P> Here, a = 20, b = 80, c = 1, and d = 99 . Then the relative risk of cancer associated with smoking would be </P>

What are the uses of relative risk to a clinician