Card 7 / 11: The following information is for Questions 4?-5 The 1 year risk (i.e. annual incidence) of lung cancer in smokers is 140 per 100,000. The 1 year risk of lung cancer in non?-smokers of the general population is 10 per 100,000.Calculate the RR of lung cancer in smokers vs. non?-smokers.
Answer:
RR=140/100,000 divided by 10/100,000 = 14 Note: When the disease is rare (as is lung cancer) the OR approximates the RR.
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Epidemiology & Biostatistics Cohort Studies
Author:
Dr.Janet ForresterProfessor
Tufts University School of Medicine
USA
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