A Five-Year Prospective Cohort Study Has Just Been Completed

question 9

Multiple Choice

A five-year prospective cohort study has just been completed. The study was designed to assess the association between supplemental vitamin A exposure and mortality and morbidity for measles. The RR for incidence of measles was 0.75, and the RR for measles mortality was 0.5. Which statement is correct?

• A) A cohort study is not an appropriate study design in this case because the association between one exposure and two different outcomes is being considered.
• B) One of the problems that this study may have faced is individuals lost to follow-up during the five-year period.
• C) A cohort study is not a good design to study this association because measles is a very common disease.
• D) Supplemental vitamin A increases the incidence of measles.
• E) None of these is correct.

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