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How to Calculate Odds Ratio.
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How to Calculate Odds Ratio.

Rosemary Njeri

The odds ratio is defined as the ratio of the odds of A in the presence of B and the odds of A in the presence of B.

The odds ratio can also be used to determine whether a particular exposure is a risk factor for a particular outcome, and to compare the magnitude of various risk factors for that outcome.

Formula to calculate odds ratio.

Calculate Odds Ratio.

Example:

If 12 smokers have lung cancer, 60 smokers do not have lung cancer, 1 non-smoker has lung cancer, and 90 non-smokers do not have lung cancer, calculate the odd ratio.

Calculate Odds Ratio.

Thus, the smokers has 20 times the odds of having lung cancer than non-smokers. 

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