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InfectionNo InfectionAtorvastatin (10 mg)a9774Placebo27243

Question

Odds Ratio and Relative Risk

Find the odds ratio and relative risk for an infection in the group treated with atorvastatin compared to the placebo group. Based on this result, does atorvastatin appear to increase the risk of an infection? Why or why not?

Infection
No Infection
Atorvastatin (10 mg)
a9
774
Placebo
27
243
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Infection No Infection Atorvastatin (10 mg) a9 774 Placebo 27 243

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check_circleAnswer
Step 1

From the given information, a = 89, b = 774, c = 27 and d = 243

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The formula for odds ratio is Odds Ratio
bc
ad
Odds Ratio
bc
89x243
774x 27
21,627
20,898
=1.03
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ad The formula for odds ratio is Odds Ratio bc ad Odds Ratio bc 89x243 774x 27 21,627 20,898 =1.03

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Step 2

Thus, the odds ratio value is 1.03.

 

The relative risk an infection in the group treated wi...

RR=a+b
C
89
89 774
27
27 243
0.103
0.1
1.03
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RR=a+b C 89 89 774 27 27 243 0.103 0.1 1.03

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