A community has 1000 cases of an acute febrile illness reported over 4 weeks. The attack rate in males is 30% (150/500) and in females is 10% (50/500). What is the sex-specific Relative Risk (RR) for males?
- A RR = 3.0 ✓
- B RR = 1.5
- C RR = 2.0
- D RR = 0.33
Correct answer: A. RR = 3.0
Explanation
RR (males vs females) = attack rate in males / attack rate in females = 0.30 / 0.10 = 3.0. Males are 3 times more likely than females to acquire the disease, suggesting a sex-linked exposure or susceptibility factor. The total case count and time period are not needed for the relative risk, which uses the attack rates directly.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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