In a cohort, 40 of 200 exposed and 40 of 800 unexposed people develop the disease. What is the attributable risk in the exposed?
Answer and explanation
Correct answer: B. 15 percentage points
- Step 1: Risk in exposed is 40/200 = 20 percent; in unexposed 40/800 = 5 percent. Step 2. Attributable risk is the difference, 20 minus 5. Answer: 15 percentage points. Why not the others: 4 is the relative risk, 25 is a sum, and 5 is the baseline risk.
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