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Relative risk — USMLE Step 3 MCQ

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EasyPreventive Medicine, Epidemiology, BiostatisticsRelative riskUSMLE Step 3

In a cohort study, 40 of 1000 exposed workers develop dermatitis, compared with 10 of 1000 unexposed workers. The occupational health team asks for the relative risk. Which of the following is the most likely explanation for this patient's findings?

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Correct answer: E4.0

Risk in exposed is 40/1000 = 0.04; risk in unexposed is 10/1000 = 0.01; relative risk is 4.0.

Reference: Modern Epidemiology