How do case-control and cohort designs differ?
a) In case-control, the groups are studied prospectively, but in cohort designs, the groups are studied retrospectively.
b) In case-control, only one group is studied, but in cohort designs, more than one group is studied.
c) In case-control, the groups are selected on the basis of an outcome that has already occurred, but in cohort designs, the groups are selected before the outcome has occurred.
d) In case-control, the groups are selected before the outcome has occurred, but in cohort designs, the groups are selected on the basis of an outcome that has already occurred.
Correct Answer: c
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