Question
State which method to control for confounding is being used in the following scenarios. In each scenario, exercise is the exposure, myocardial infarction is the disease, and gender is the confounder.
A study of exercise and myocardial infarction that is limited to men.
A case-control study of exercise and myocardial infarction that includes men and women. Controls are selected so that the proportions of male and female subjects groups are identical.
A study of exercise and myocardial infarction that includes men and women. The study determines the relative risk separately for men and for women and compares these with the crude relative risk.
