MFPHMI Part I Practice Questions - Membership Of The Faculty Of Public Health Medicine Part I (RCPI, Ireland) Exam

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A case-control study reports an odds ratio (OR) of 3.0 for oral contraceptive use among women with venous thromboembolism compared with controls. When is the OR a reasonable approximation of the relative risk?

When the outcome is rare in the source population. When the exposure is rare in the source population. When the study uses individual matching of cases and controls. When the outcome is common (prevalence above 10%).

Correct Answer:

When the outcome is rare in the source population.

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