Suspected factor in the etiology of a disease

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In cohort studies of the role of a suspected factor in the etiology of a disease, it is essential that: The exposed and non-exposed groups under study be as similar as possible with regard to possible confounding factors.

The Review Questions answers do not address (why nots)...So why is the answer not: There should be equal numbers of persons in both study groups?

Reference no: EM13894983

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