structure
Forum Junior
Topics: 26
Posts: 28
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A case-control study is conducted to assess the possible relationship between regularuse of aspirin and colon cancer. the odds ratio for colon cancer among aspirin users os 0.6 with a 95% coonfidence interval of 0.4 to 0.9. Which of the following is the most accurate conclusion?
A. Thae attributable risk of colon cancer from aspirin use is 6 per 1000 person-years
B. the incidence of colon cancer among aspirin users is 6 per 1000 person-years
C. the incidence of colon cancer among nonusers of aspirin is 6 per 1000 person-years
D. the probability of confounding bias is less than 5%
E. the risk of colon cancer is 40% lower in aspirin users rhan nonusers
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| Perhaps
Forum Elite
Topics: 61
Posts: 162
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I picked D, but now I think it is probably E.
Odd ratio approaches RR when it is a rare disease. I kind of assume it is kind of rare, so take the RR as 0.6; then E probably right
It should be probability of by random is 5%. P value can't help with confounding, right?
Not sure
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| study_ing
Forum Fanatic
Topics: 180
Posts: 2,511
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hmm but odds ratio is used interchangeably with relaticve risk only if the disease is rare. colon cancer is common--infact it merits screening. wud it b justifiable to use OR as RR here?
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