Sagot :
Relative risk is a ratio of the probability of an event happening in the disclosed group versus the probability of the event happening in the non-exposed group. For instance, the relative risk of acquiring lung cancer (event) in people who smoke (exposed group) versus people who don't smoke (non-exposed group) would be the probability of acquiring lung cancer for smokers divided by the probability of acquiring lung cancer for nonsmokers. The relative risk does not deliver any details about the whole risk of the event happening, but rather the higher or lower probability of the occurrence in the exposure versus the non-exposure group.
The relative risk is confounded by some with the odds ratio and absolute risk. Relative risk is the ratio of the probability of an event happening with an exposure versus the probability of the event happening without exposure. Thus to compute the relative risk, we must understand the exposure status of all people (either exposed or not exposed). This suggests that relative risk is only suitable for cases where the exposure status and incidence of sickness can be accurately defined, such as forthcoming cohort investigations.
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