In the following example, we will explore when the odds ratio will approximate the risk ratio. Cohort study A

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4. In the following example, we will explore when the odds ratio will approximate the risk ratio.

Cohort study A:

 

Diseased

Not Diseased

Total

Exposed

5

195

200

Unexposed

10

790

800

 

15

985

1000

  1. Calculate the risk ratio.

  2. Calculate the odds ratio.

  3. Does the odds ratio do a good job of approximating the risk ratio?

Cohort study B:

 

Diseased

Not Diseased

Total

Exposed

100

100

200

Unexposed

200

600

800

 

300

700

1000

 

  1. Calculate the risk ratio.

  2. Calculate the odds ratio.

  3. Does the odds ratio do a good job of approximating the risk ratio?

  4. What changed from Cohort A to Cohort B?

  5. When does the OR do a good job of approximating the RR?

    • 6 years ago
    In Nairobi, Kenya, a study of mother-to-infant transmission of HIV during breastfeeding was conducted.
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