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USMLE Step 3 Practice Questions - United States Medical Licensing Examination Step 3 Exam

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A case-control study examines the association between NSAID use and peptic ulcer disease. Cases (n=200) are patients with confirmed peptic ulcers; controls (n=400) are age-matched patients without ulcers. The study finds that 120 cases and 80 controls reported regular NSAID use. What measure of association can be calculated from this study design?
Correct Answer:
Odds ratio

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