Measure of associations
Exercise 3.7
1. Rate ratio comparing current smokers with nonsmokers
Rate ration = rate of current smokers/rate of nonsmokers
(Rate of current smokers = rate of smokers per 1000 persons-years = 1.3)
(Rate of nonsmokers = rate of nonsmokers per 1000 persons-years = 0.07)
Rate ration = 1.3/0.07
=18.57
2. Rate ratio comparing ex-smokers who quit at least 20 years ago with nonsmokers
Rate ration = rate of ex-smokers quitting at 20 years/rate of nonsmokers
(Rate of ex-smokers quitting at 20 years = rate per 1000 persons-years = 0.19)
(Rate of nonsmokers = rate per 1000 persons-years = 0.07)
Rate ration = 0.19/0.07
= 2.71
3. What are the public health implications of these findings?
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