Practice Questions with Odds Ratios PDF

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Practice problems for HLPR222 with Odds Ratios...

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Practice Problems with Odds Ratios Disease

No Disease

Totals

Exposed

A

B

A+B

Not Exposed

C

D

C+D

A+C

B+D

A+B+C+D

Totals OR = ( A x D ) ( B x C) Required components: 1. 2. 3. 4.

Name the exposure Name the outcome Include the OR value Interpretation of the OR value (“times as likely to have”)

Generic Interpretations: ■ ■ ■

An odds ratio of 1.0 implies that the exposed are equally likely to have the outcome as compared to the non-exposed (no relationship) An odds ratio >1 indicates that the exposed are more likely to have the disease compared to the nonexposed (positive association, harmful effect) An odds ration 1 hour per day) of violent television when they are age 5-7 years. From their reports, it was determined that 22 children with ADD watched high levels of violent TV and 30 children without ADD watched high levels of violent TV. Create a 2 x 2 table for this study: Disease

No Disease

Totals

Exposed

22

30

52

Not Exposed

30

118

148

Totals

52

148

200

How many children were Controls? 30 Calculate the Odds Ratio and INTERPRET the results:

22x118 / 30x30 = 2596 / 900 = 2.88...