Relative Risk

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What does RR mean?

Relative risk
In statistics and epidemiology, relative risk is the ratio of the probability of an event occurring in an exposed group to the probability of the event occurring in a comparison, non-exposed group. Relative risk includes two important features: a comparison of risk between two "exposures" puts risks in context, and "exposure" is ensured by having proper denominators for each group representing the exposure 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. Here, a = 20, b = 80, c = 1, and d = 99. Then the relative risk of cancer associated with smoking would be Smokers would be twenty times as likely as non-smokers to develop lung cancer. Another term for the relative risk is the risk ratio because it is the ratio of the risk in the exposed divided by the risk in the unexposed. Relative risk contrasts with the actual or absolute risk, and may be confused with it in the media or elsewhere.

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