In a cohort study, the incidence of coronary artery disease in smokers is 40 per 1000 person-years and in non-smokers is 10 per 1000 person-years. The Attributable Risk Percent (AR%) in smokers is:
- A 25%
- B 60%
- C 75% ✓
- D 400%
Correct answer: C. 75%
Explanation
Attributable Risk Percent (AR%) = (Incidence in exposed - Incidence in unexposed) / Incidence in exposed × 100 = (40-10)/40 × 100 = 30/40 × 100 = 75%. This means 75% of coronary artery disease in smokers can be attributed to smoking. Relative Risk = 40/10 = 4, but that is not what is asked.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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