Computational detailsįor the confidence interval of the difference between two rates, MedCalc uses the "Test based Method" given on page 169 of Sahai H, Khurshid A (1996). If the P-value is less than 0.05 it can be concluded that the ratio R1/R2 is significantly different from 1 (which is the case when the rates are equal). The ratio of the two rates (the incidence rate ratio) R1/R2 with its 95% Confidence Interval and associated P-value.If the P-value is less than 0.05 it can be concluded that there is a statistical significant difference between the two rates. The difference between the two rates R2-R1 with its 95% Confidence Interval and associated P-value.
The (incidence) rate in the two groups with their Poisson 95% Confidence Interval.the rate 10/200 equals 0.05 and can be represented as 1:20. Option Express result as 1:X: when this option is selected the rate R will be displayed as 1:(1/R), e.g.Denominator: for example the total person-years for each group.
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