he first involved an assessment of the relationship between cigarette smoking and incidence of lung cancer. For cigarette smokers, the lung cancer incidence rate was Ie = 200 per 100,000. For...

he first involved an assessment of the relationship between cigarette smoking

and incidence of lung cancer. For cigarette smokers, the lung cancer incidence rate was Ie = 200

per 100,000. For nonsmokers, the lung cancer incidence rate was Io = 25 per 100,000. The lung

cancer incidence rate in the entire population was It = 100 per 100,000. The second study

involved an assessment of the relationship between cigarette smoking and incidence of coronary

heart disease. For cigarette smokers, the coronary heart disease incidence rate was Ie = 500 per

100,000. For nonsmokers, it was Io = 250 per 100,000. In the overall population, the coronary

heart disease rate was It = 300.

1. What is relative risk the of developing lung cancer in the first study and of developing
coronary heart disease in the second study? Interpret.
2. From the data involving cigarette smoking and lung cancer incidence, what are the
attributable risk and the attributable-risk percent? Interpret the result.
3. From the data involving cigarette smoking and coronary heart disease incidence, what are the
attributable risk and the attributable-risk percent? Interpret the result.
4. Is cigarette smoking a stronger risk factor for lung cancer or coronary heart disease? Explain.
5. Hypothetically speaking, if cigarette smoking could be eliminated from this population, what
percentage of lung cancer and of coronary heart disease could be avoided