In an investigation of a food-borne outbreak at a wedding, the attack rate among those who ate biryani was 70% and among those who did not eat biryani was 10%. The Relative Risk of illness associated with eating biryani is:
- A 0.14
- B 60
- C 7 ✓
- D 6
Correct answer: C. 7
Explanation
Relative Risk (RR) = Attack rate among exposed / Attack rate among unexposed = 70% / 10% = 7. An RR of 7 means that those who ate biryani had 7 times the risk of developing illness compared to those who did not. RR is the measure of association used in cohort studies and outbreak investigations.
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.