The Population Attributable Risk (PAR%) for a risk factor with a Relative Risk of 4 and a population exposure prevalence of 30% is approximately:

• A 56%
• B 69%
• C 75%
• D 47% ✓

Explanation

PAR% = [Pe(RR − 1)] / [1 + Pe(RR − 1)] × 100, where Pe = prevalence of exposure in population and RR = relative risk. Substituting: [0.30 × (4 − 1)] / [1 + 0.30 × (4 − 1)] × 100 = (0.90) / (1.90) × 100 ≈ 47.4%. This measures the proportion of disease in the total population attributable to the risk factor.

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

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.