Q9. In the following example, we will explore when the odds ratio will approximate the risk...
Q9. In the following example, we will explore when the odds ratio will approximate the risk ratio.(1x8pts)
Cohort study A:
|
Diseased |
Not Diseased |
Total |
|
|
Exposed |
5 |
195 |
200 |
|
Not Exposed |
10 |
790 |
800 |
|
Total |
15 |
985 |
1000 |
a. Calculate the risk ratio (1pt)
b. Calculate the odds ratio (1pt)
c. Does the odds ratio do a good job of approximating the risk ratio? (1pt)
Cohort study B:
|
Diseased |
Not Diseased |
Total |
|
|
Exposed |
100 |
100 |
200 |
|
Not Exposed |
200 |
600 |
800 |
|
Total |
300 |
700 |
1000 |
d. Calculate the risk ratio (1pt)
e. Calculate the odds ratio (1pt)
f. Does the odds ratio do a good job of approximating the risk ratio? (1pt)
g. What changed from Cohort A to Cohort B? (1pt)
i. When does the OR do a good job of approximating the RR? (1pt)
Homework Answers
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Q9. In the following example, we will explore
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