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A 1980 study investigated the relationship between the use of OCs and the development of endometrial...

A 1980 study investigated the relationship between the use of OCs and the development of endometrial cancer. The researchers found that of 117 endometrial-cancer patients, 6 had used the OC Oracon at some time in their lives, whereas 8 of the 395 controls had used this agent. With this information, calculate an odds ratio and a 95% Confidence Interval. Then interpret the ratio with the 95% confidence interval.

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Answer #1
Used OC Oracon Didn't used OC Oracon Total
Endometrial cancer patients 6 111 117
Controls 8 387 395
Total 14 498 512

Odds ratio=

The formula for the 95% Confidence Interval for the odds ratio is as follows:

The standard error for log(OR) is computed using the following equation:

=

95% CI=

=

In this study, subjects using OC ocaron are 2.614 times the odds of developing Endometrial cancer compared to non-user subjects. With 95% confidence, the true odds ratio lies in the range of (0.888,7.699)

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