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Question: A case-control study was conducted to evaluate the relationship between aspirin use and the risk …

The link between aspirin use and the incidence of colon cancer was investigated in a case-control study. The study included 2,000 patients and 2,000 controls. 1,800 of the cases had previously used aspirin, while 1,200 of the controls had previously used aspirin. To establish the strength of the link between aspirin and colon cancer, what measure of association should be calculated? a. Rate ratio b. Risk ratio c. Odds ratio d. Attributable risk