The data below show the results for a study of the relationship between cutaneou

Question

The data below show the results for a study of the relationship between cutaneous melanoma (the response of interest) and sun protection (the exposure). Four hundred two people who had cutaneous melanoma were located and then provided information on whether they had sun protection during childhood. Four hundred twenty-two people selected from the same population who did not have cutaneous melanoma were also asked about childhood sun protection. Protection 99 No Protection 303 002 Melanoma No Melanoma Total 132 231 290 593 422 824 Total 40 What type of study is this? O a Clinical trial O b. Cohort O c. Case-control O d None of the above

Explanation / Answer

This is a classic example of case-control study that compares patients who have a disease (cases) with patients who do not have the disease (controls), and looks back retrospectively to compare how frequently the exposure to a risk factor is present in each group .Thus the right answer is C

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