The Attributable Risk Percent (AR%) in the exposed is 60% for a particular exposure-disease pair. What does this mean?
- A 60% of the disease risk in exposed individuals is attributable to the exposure ✓
- B 60% of all cases of the disease are due to the exposure
- C The relative risk is 1.6
- D Removing the exposure would eliminate 60% of cases in the entire population
Correct answer: A. 60% of the disease risk in exposed individuals is attributable to the exposure
Explanation
Attributable Risk Percent in the exposed (also called Etiologic Fraction in the exposed) = (Risk in exposed − Risk in unexposed) / Risk in exposed × 100 = 60%. This means 60% of the disease occurrence in exposed individuals can be attributed to the exposure. Population Attributable Risk Percent (PAR%) estimates the proportion of total disease cases in the entire population attributable to the exposure — that is a different measure. AR% in exposed does not directly give the RR.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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