Consider these hypothetical data: A prospective cohort study was conducted to ex

Question

Consider these hypothetical data: A prospective cohort study was conducted to examine the association between regular use of sunscreen (exposure) and developing melanoma (outcome); the researchers were also interested to see if age was an effect modifier of this association. Here are the study results Number of Person Sunscreen Use Age over 60 years Number of Cases Incidence Rate per of infection 20 Yes Yes No No Yes No Yes No 200 350 200 350 1000 100 14 125 129 25 45 The relative risk of melanoma in older sunscreen users compared to younger users is: O a RR 0.78 b.RR 1.25 ° C. RR = 7.14 O d. RR = 8.93

Explanation / Answer

Relative Risk = (Incidence rate per older sunscreen user)/ (incidence rate pet Younger sunscreen user)

= 100/47

= 7.14

Answer : Option C)

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