Which measure of association is EXCLUSIVELY used in case-control studies as the primary measure?
- A Odds Ratio ✓
- B Relative Risk
- C Attributable Risk
- D Incidence Rate Ratio
Correct answer: A. Odds Ratio
Explanation
Odds Ratio is the primary measure of association in case-control studies because incidence cannot be directly calculated (the sampling begins with outcome status, not exposure). RR and incidence-based measures require incidence data available only from cohort or experimental studies.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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