A case-control study should find controls similar to the characteristics of the cases (such as age and sex), but without the disease, and obtain histories on them.

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This is the basic concept of a case-control study. Controls should be selected based on similarities to the cases in terms of demographics, but without the disease or condition of interest. This allows researchers to compare the two groups and identify potential risk factors for the condition being studied.

A Case-Control Study Should Find Controls Similar to the Characteristics