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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???

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The solution examines Cohort Studies of the role of a suspected factor in the etiology of a disease.

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Equal number of perswon in each group does not ensure that the groups are similar. When we are measuring effect of a treatment, we need to ensure that the effect of all the factors which are not being measured ...

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