A cohort study of coffee drinking and anxiety was conducted at a university camp

Question

A cohort study of coffee drinking and anxiety was conducted at a university campus. There were a total of 30,000 freshmen who participated. 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.

1. Calculate the risk difference using the given data. The numeric value of the risk difference is ....

6.0%

4.0 %

5.0 %

None of the above

2. Which of the following is the correct interpretation of the risk difference?

a. Coffee drinkers are “x” times as likely to develop anxiety as compared to non-coffee drinkers.

b. The excess risk of anxiety among the coffee drinkers is “x” as compared to non-coffee drinkers.

c. The excess risk of anxiety among the entire freshmen population is “x”

d. None of the above

a. Calculate the overall attack rate

Explanation / Answer

Solution:-

1. option C. 5.0%

=> The numeric value of the risk difference is 5.0%

2. option a. Coffee drinkers are “x” times as likely to develop anxiety as compared to non-coffee drinker.

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