A cohort study was conducted to study the association between coffee drinkers an

Question

A cohort study was conducted to study the association between coffee drinkers and anxiety in a population-based sample of adults. Among 20,000 coffee drinkers, 500 developed anxiety. Among the 50,000 noncoffee drinkers, 250 cases of anxiety were observed. Develop a table to determine the relative risk of anxiety associated with coffee use. What is the relative risk (RR)?

3) For the study given in question #2, what is the etiologic fraction? Why is determining the etiologic fraction sometimes necessary for determining true risk?

Explanation / Answer

forming the table

                               anxiety yes                     anxiety no

drinking coffeee yes                 500                               19500

drinking coffee no              250                                    49750

   total    750    69250

relative risk = 500 / 19500 / 250 / 49750

relative risk = .0256 / .0050 = 5.12

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