A retrospective cohort study is conducted of the relationship between the use of estrogen and coronary heart disease. A total of 5000 exposed and 5000 unexposed women are enrolled and followed for 15 years for the development of myocardial infection. A total of 200 estrogen users developed the outcome compared with 300 myocardial infractions among the nonusers.

A. What is the risk of a myocardial infarction among estrogen users?

B. What is the risk of a MI among nonusers of estrogen?

C. What is the risk ratio of a MI?

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A retrospective cohort study is conducted of the relati... View the full answer