Is there a significant difference between these incidence rates? Report a p-value (two-tailed)? Cancer Suppose we wish
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Is there a significant difference between these incidence rates? Report a p-value (two-tailed)?
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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To compare the incidence rates we have Thus we can use the normal th...View the full answer
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