Which one of the following statements about cohort studies and case-control stud

Question

Which one of the following statements about cohort studies and case-control studies is INCORRECT? For cohort studies, the odds ratio is the best measure of association, whereas in case- control studies the rate ratio is always used. The cohort design is best when exposure is rare, whereas the case-control design is best when the disease is rare. In a cohort study, subjects are selected and classified according to exposure status Case-control studies are usually less expensive and quicker to conduct than cross- sectional studies The cohort design is best when disease is relatively frequent among exposed, whereas the case-control design is best when exposure is relatively frequent among the diseased.

Explanation / Answer

Option a is correct because the odd ratio is best measure of association in case control study and in case control study rate ratio is nearly same.

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