When selecting controls for a casecontrol study all of the f

When selecting controls for a case-control study, all of the following are considerations except: a. Controls should estimate the distribution of exposure in the source population b. Controls should be sampled independently of exposure status c. Controls need to be representative of at risk population. d. Controls should have the same exposure prevalence as the cases e. None of the above.

Solution

Correct option is c. Controls need to be representative of at risk population.

. Controls are used to estimate the prevalence of exposure in the population which gave rise to the cases. Therefore, the ideal control group would comprise a random sample from the general population that gave rise to the cases.