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3. Explain what is meant by the term relative risk and explain how it is used in cohort studies.
5. A study was conducted to examine the association between coffee drinking and anxiety in a population-based sample of adults who were followed over 10 years. Among 10,000 coffee drinkers, 500 developed anxiety. Among the 20,000 non-coffee drinkers, 200 cases of anxiety were observed.
What type of study is this?
What is the two by two table for this study?
What is the relative risk of anxiety associated with coffee use?
6. How is a case-control study different from a retrospective cohort study? List the key criteria that, in general, would influence you to select one approach over the other.
13. Explain what is meant by the statement that cohort studies overcome the problem of temporality, which is not addressed by other types of observational study designs.