relative risk (risk ratio)
Case scenario: A cohort study involved an assessment of the relationship between cigarette smoking and incuof lung cancer. For cigarette smokers, the lung cancer incidence rate was Iexp = 200 per 100,000. For nonsmokers, the lung cancer incidence rate was Iunexp = 25 per 100,000. The lung cancer incidence rate in the entire population was Itotal = 100 per 100,000.
A) what is the relative risk (risk ratio) of developing lung cancer? Interpret this value in plain language?
B) calculate the attributable risk and interpret this value in plain language?
C) calculate the attributable-risk percent and interpret this value in plain language?
D) is cigarette smoking a risk factor for lung cancer? Explain your answer.
E) Hypothetically speaking, if cigarette smoking could be eliminated from this population, what percentage of lung cancer could be avoided?
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