In a cohort study of 5,000 smokers and 5,000 non-smokers followed for 10 years, 200 smokers and 40 non-smokers developed lung cancer. The attributable risk percent (AR%) in the exposed group is:
- A 80% ✓
- B 75%
- C 60%
- D 50%
Correct answer: A. 80%
Explanation
Incidence in smokers = 200/5000 = 40 per 1000; incidence in non-smokers = 40/5000 = 8 per 1000. Attributable risk = 40 - 8 = 32 per 1000. AR% = (32/40) × 100 = 80%. This represents the proportion of disease in exposed individuals attributable to the exposure itself, assuming a causal relationship.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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