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In a population-based cohort study, an entire community was interviewed regardin

ID: 3149790 • Letter: I

Question

In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. Upon ascertainment of all lung cancer deaths, the investigator obtained the following data:

4) Calculate the proper measure of association of smoking and lung cancer death. Interpret your results.

5) Calculate the population risk difference. Interpret your results. ( 4 points)

6) Calculate the population etiologic fraction for smoking and lung cancer based on these data. Interpret your results. ( 4 points)

# of individuals lung cancer deaths smokers 24,500 15 non-smokers 10,500 2

Explanation / Answer

4) Calculate the proper measure of association of smoking and lung cancer death

P = 15 / 35017 = 0.0004

5)

Population risk difference = 24500 -10500 / 35017 = 0.3998

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