In a case-control study among African Americans, controls were matched to cases

Question

In a case-control study among African Americans, controls were matched to cases on sex and age. In addition, the researchers collected data on a number of potential confounding variables including smoking status, education, and alcohol consumption. Nonetheless, the researchers were unable to study the association of the disease with which of the following factors? A. Sex and age B. Sex, age, race/ethnicity, smoking status, education, and alcohol consumption C. Sex, age, race/ethnicity D. Race/ethnicity, age, smoking status, education, and alcohol consumption E. Smoking status, education, and alcohol consumption

Explanation / Answer

A. Sex and Age

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