The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among s

Question

The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among smokers. The death rate per 100,000 for coronary thrombosis is 422 among non-smokers and 599 among smokers. The prevalence of smoking in the population is 55%.

The relative risk of dying for a smoker compared to a non-smoker is: [Refer to the chapter titled “Study Designs: Cohort Studies”]

10.1 for lung cancer and 8.4 for coronary thrombosis.

10.1 for lung cancer and 1.4 for coronary thrombosis.

12.4 for lung cancer and 1.7 for coronary thrombosis.

9.1 for lung cancer and 0.30 for coronary thrombosis.

9.1 for lung cancer and 1.4 for coronary thrombosis.

10.1 for lung cancer and 8.4 for coronary thrombosis.

10.1 for lung cancer and 1.4 for coronary thrombosis.

12.4 for lung cancer and 1.7 for coronary thrombosis.

9.1 for lung cancer and 0.30 for coronary thrombosis.

9.1 for lung cancer and 1.4 for coronary thrombosis.

Explanation / Answer

The relative and attributable risk can be calculated as follows:

Rate Ratio (RR) = Incidence rate in exposed group (r1)
                           Incidence rate in unexposed group (r0)

RR= 71 per 100,000 / 7 per 100,000 = 10.1 (multiplier cancels out)

"10.1 times more likely to get lung cancer if you smoke"

The death rate per 100,000 for coronary thrombosis is 422 among non-smokers and 599 among smokers.

RR= 599 per 100,000 / 422 per 100,000 = 1.42 per 100,000

"1.42 times more likely to get coronary thrombosis if you smoke"

Hence answer is 10.1 for lung cancer and 1.4 for coronary thrombosis.

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