An investigator interested in studying the relationship between an exposure \"X\

Question

An investigator interested in studying the relationship between an exposure "X" and the risk of some outcome "Y" reported a risk ratio of o.75. Which of the following best describes the interpretation of this effect measure? Exposed persons are 75% more likely to acquire disease compared with unexposed persons. 75% of disease in the exposed is due to the exposure Exposed persons are 25% less likely to acquire disease compared with unexposed persons Unexposed persons are143% less likely to acquire disease compared with exposed persons. Exposed persons are 75% less likely to acquire disease compared with unexposed persons.

Explanation / Answer

Relative risk (in this situation) is the ratio of the probability the disease of occurring in an exposed group to the probability of the disease occurring in a comparison, unexposed group.

The general interpretation of Relative risk(RR) is as follows:

Hence from the above information, we can conclude that the correct option here is the fourth option, Exposed persons are 75% less likely to acquire disease compared with unexposed persons.

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