An epidemiologist was interested in determining whether aspirin was associated w

Question

An epidemiologist was interested in determining whether aspirin was associated with an increased risk of gastrointestinal (GI) bleeding. She relied on primary physicians to identify 600 patients at a hospital who were taking a daily dose of aspirin and 600 other patients who were not taking aspirin. Subjects were followed for 1 year to detect any occurrences of GI bleeding. Due to publicity about the risk of bleeding associated with aspirin, primary physicians treating patients at the hospital followed their patients who were taking aspirin more closely than they were unexposed subjects. Which of the following describes the impact that this may have on the epidemiologist's study? A. More patients are put on aspirin and are thus placed in the case group B. More patients are taken off aspirin and are thus placed in the control group C. More patients taking aspirin are diagnosed with GI bleeding D. More patients taking aspirin are found not to have GI bleeding

Explanation / Answer

"B" describes the situation well

i.e more patients are taken off aspirin and are thus placed in control group.

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