Odds Ratio and log Odds Ratio

The Odds ratio relating the odds of being a case to not being a case for those with the risk factor (A/B) to these same odds for those without the risk factor (C/D) is: 

   
                          A/B
           ODDS Ratio =   ___
                          C/D
This has been shown to be a good approximation to the Relative Risk for uncommon diseases. 

            Disease Incedence
Risk Factor Present Absent Total
Present Cell A Cell B Cell A + B
Absent Cell C Cell D Cell C + d
Total Cell A + C Cell B + D T

Enter the values for your 2 x 2 table:

Cell A Cell B

Cell C Cell D


Estimated Odds Ratio

Estimated log Odds Ratio

Estimated Standard Error of the log Odds Ratio

Lower Confidence Limit of log Odds Ratio (95%)

Upper Confidence Limit of log Odds Ratio (95%)

Lower Confidence Limit of Odds Ratio (95%)

Upper Confidence Limit of Odds Ratio (95%)


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