The 'attributable risk percent' (aetiologic fraction) in the exposed group is best defined as:

• A The proportion of all cases in the total population attributable to the exposure
• B The absolute number of extra cases caused by the exposure
• C The relative risk minus one, expressed per thousand
• D The proportion of cases in the exposed group attributable to the exposure ✓

Explanation

Attributable Risk Percent (in exposed) = [(Risk in exposed − Risk in unexposed) / Risk in exposed] × 100 = [(RR−1)/RR] × 100. This gives the proportion of disease in exposed individuals attributable specifically to the exposure, assuming causality. The population attributable risk percent (PARP) is a different measure applying to the entire population. AR% is used to estimate potential benefit of removing a causal exposure in the exposed group.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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