Epidemiologists decided to investigate the effect of sunscreens on sunburns.They ran an epidemiologic study to see the association of sunscreens and sunburns.Overall,460 people have enrolled in the study.Investigators randomly allocated 230 people to the treatment group (sunscreens) and 230 to the control group (placebo) .They exposed those 460 people to the high mountain trail on a sunny day.At the end of the study,30 people developed sunburns in the sunscreen group and 130 people developed sunburns in the placebo group.What type of study design is this?

A) Cross-sectional study
B) Prospective cohort study
C) Case-control study
D) Randomized trial
E) Case-control study.

Question

Kennady Simpson · Accepted Answer

Final Answer : D, Explanation :  Investigators randomly allocated the exposure status to the participants.Therefore it is a randomized trial.Cross-sectional study is not correct because they did not capture exposure and outcome status at the same time.Prospective cohort study is not correct because they did not recruit the people based on their exposure status.Case-control study is not correct because they did not define the people based on their outcome status.Case-control study is not correct because they did not report a case or series of cases.

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