Posted: October 3rd, 2016

The proportion of the total incidence of CHD in smokers that is attributable to smoking i

3. A random sample of middle age sedentary males was selected from four census tracts, and each man was examined for coronary artery disease. All those having the disease were excluded from the study. All others were randomly assigned to either an exercise group, which followed for a two-year program of systematic exercise, or to a control group, which had no exercise program. Both groups were observed semiannually for any difference in incidence of coronary heart disease.

• What type of study (study design) you would assign to this information? Why? [ONE POINT]
4. Several studies have found that approximately 95% of cases of lung cancer are due to cigarette smoking. This measure is an example of: [ONE POINT]
a. An incidence rate
b. A relative risk
c. A prevalence risk
d. A proportionate mortality ratio
e. An attributable risk

Questions 5 and 6 refer to the following information:

OUTCOME AFTER 10 YRS

At Beginning of Study CHD Developed CHD Did Not Develop

2,000 Healthy smokers 100 1,900

4,000 Healthy nonsmokers 30 3,970
The results of a 10-year cohort study of smoking and coronary heart disease (CHD) are shown above:

5. The incidence of CHD in smokers that can be attributed to smoking is: [ONE POINT]

6. The proportion of the total incidence of CHD in smokers that is attributable to smoking is: [ONE POINT]

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