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Numeric value of the risk difference

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A cohort study of coffee drinking and anxiety was conducted among 30,000 freshmen. 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 study died or was lost during the follow-up period.

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

  1. 6%
  2. 4%
  3. 5%
  4. None of the above

Reference no: EM131086146

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