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In case-control studies, the odds ratio is used as an estimate of the relative risk. In order for this approximation to be reasonable, some conditions must be met. Which of the following conditions is not necessary in order to use the odds ratio to estimate the relative risk?

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edalloar1989

Explanation: O.R is the ratio between the odds in the group with the factor and the odds in the group without the factor. It has to complete with some features: The odds ratio has no dimensions, has a range from zero to infinity and can have a positive or negative association if the events studied occur more or less frequently, respectively.

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