Asbestos is associated with increased risk of lung cancer. Among individuals who

Question

Asbestos is associated with increased risk of lung cancer. Among individuals who are exposed to asbestos, the risk of lung cancer is 30%. Among people who are not exposed to asbestos, the risk of lung cancer is 15%. Among the total population, 20% of the population is exposed to asbestos and 80% is not exposed to asbestos.

5a. What is the proportion of risk attributable to asbestos exposure among people who are exposed to asbestos?

5b. What is the proportion of risk attributable to asbestos exposure among the total population?

Explanation / Answer

If the total population is 100

20 is exposed to asbestos

80 are not exposed to asbestos.

5a] proportion of risk attributed to asbestos expposure among people who are exposed to asbestos ie=

30% therefore 30/100*20

=6 in every 100 people

5b] proportion of risk attributable to asbestos exposure 15/100*80=3*4=12

12 people in every 100 people

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