A Cohort Study of Coffee Drinking and Anxiety Was Conducted

A cohort study of coffee drinking and anxiety was conducted at a university campus. There was a total of 30,000 freshmen who participated. Ten thousand (10,000) were coffee drinkers and 20,000 were not. Of the coffee drinkers, 500 developed anxiety during the 4-year follow-up period. Of the non-coffee drinkers, 200 developed anxiety during the same time period. Assume that no one in the population died or was lost during the follow-up period. Construct a two by two table with the given data, making sure that you have labeled the margins correctly.
-Which measure of association is commonly used by public health officials to determine which exposures are most important to the entire population and helps prioritize prevention activities?

A) Risk/Rate ratio (a.k.a. relative risk)
B) Risk/Rate difference
C) Population risk/rate difference
D) None of the above