What are the estimated incidence rates in the ASA and control groups? Cancer Suppose we wish to
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What are the estimated incidence rates in the ASA and control groups?
Cancer
Suppose we wish to study the association between aspirin intake and the incidence of colon cancer. We find that 10% of women take 7 aspirin tablets per week (ASA group), while 50% of women never take aspirin (control group). The ASA group is followed for 50,000 person-years, during which 34 new colon cancers occurred over a 20-year period. The control group is followed for 250,000 person-years, during which 251 new colon cancers developed over a 20-year period.
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