Card 6 / 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 and interpret the odds ratio describing the association between smoking and lung cancer.
Answer:
Putting the numbers in a 2x2 table format is easiest to calculate an OR A=140 B=99,860 OR=AD/BC or 140*99,990 / 10*99,860 = 14 C=10 D=99,990 Interpretation: over 1 year, smokers are 14 times as likely to develop lung cancer as non?-smokers Note: The OR is interpreted in exactly the same way as a RR.
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Epidemiology & Biostatistics Cohort Studies
Author:
Dr.Janet ForresterProfessor
Tufts University School of Medicine
USA
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