A case-control study finds that 60 of 100 cases and 30 of 100 controls had prior statin use. What is the odds ratio for statin use in relation to the outcome?
- A 1.5
- B 3.5 ✓
- C 2.0
- D 4.0
Correct answer: B. 3.5
Explanation
Odds in cases = 60/40 = 1.5; Odds in controls = 30/70 ≈ 0.4286. OR = 1.5/0.4286 = 3.5. An OR > 1 indicates higher odds of exposure among cases compared to controls. This is distinct from relative risk, which cannot be directly computed from a case-control design without incidence data.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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