Incidence is 20 per 1,000 in exposed and 5 per 1,000 in unexposed. What is the relative risk?

Answer and explanation

Correct answer: A. 4, since 20 divided by 5 is 4

  1. Step 1: RR is the ratio of incidences. Step 2. 20 / 5 = 4. Answer: 4. Why not the others: 15 is the risk difference.

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