I know the answer but I can't interpret it Risk difference 189/11,034 – 104/11,037 = 0.0171 − 0.0094 = 0.0077 or 0.77% Interpretation(s): 0.77% (absolute) to ____ in placebo group as compared to aspirin group. 0.77% --- about risk

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I know the answer but I can't interpret it

  1. Risk difference

189/11,034 – 104/11,037

= 0.0171 − 0.0094

= 0.0077 or 0.77%

Interpretation(s):

  • 0.77% (absolute) to ____ in placebo group as compared to aspirin group.
  • 0.77% --- about risk

A prospective study on the relationship between aspirin use and heart attacks by the Physicians'
Health Study Research Group at Harvard Medical School is presented below. The Physicians
Health Study was a 5-year randomized study of whether regular aspirin intake reduces risk of
myocardial infarction or heart attack. Every other day, physicians participating in the study took
either one aspirin tablet or a placebo. The study was blind - those in the study did not know whether
they were taking aspirin or aplacebo.
Of the 11,034 physicians taking a placebo, 189 suffered heart attacks over the course of the
study, whereas of the 11,037 taking aspirin, 104 had heart attacks. Can we say that the intake of
aspirin appears to diminish the risk of myocardial infarction?
Myocardial Infarction
Total
No
Group
Yes
Placebo 189
Aspirin 104
10845
11034
------
10933
11037
Total
293
21778
22071
Let patients taking placebo be the first group and those taking aspirin in the second group.
Transcribed Image Text:A prospective study on the relationship between aspirin use and heart attacks by the Physicians' Health Study Research Group at Harvard Medical School is presented below. The Physicians Health Study was a 5-year randomized study of whether regular aspirin intake reduces risk of myocardial infarction or heart attack. Every other day, physicians participating in the study took either one aspirin tablet or a placebo. The study was blind - those in the study did not know whether they were taking aspirin or aplacebo. Of the 11,034 physicians taking a placebo, 189 suffered heart attacks over the course of the study, whereas of the 11,037 taking aspirin, 104 had heart attacks. Can we say that the intake of aspirin appears to diminish the risk of myocardial infarction? Myocardial Infarction Total No Group Yes Placebo 189 Aspirin 104 10845 11034 ------ 10933 11037 Total 293 21778 22071 Let patients taking placebo be the first group and those taking aspirin in the second group.
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