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

**tutor4helpyou**

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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 |

Calculate the risk ratio.

Calculate the odds ratio.

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 |

Calculate the risk ratio.

Calculate the odds ratio.

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

What changed from Cohort A to Cohort B?

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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