Sahai H, Khurshid A (1996) Statistics in epidemiology: methods, techniques, and applications.Hanley H (1986) Analysis of Crude Data.The P-value is the exact mid-P double sided P-value (Hanley, 1986). The P-value is obtained using the Chi 2-statistic.įor the confidence interval of the incidence rate ratio, MedCalc uses the "Exact Poisson Method" given on page 172-174 of Sahai H, Khurshid A (1996). 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. You can copy-paste the text 'MedCalc Statistical Software version 19.2.6 (MedCalc Software bv, Ostend, Belgium 2020)' from the text box into your manuscript. The difference between the two rates R2-R1 with its 95% Confidence Interval and associated P-value. The most recent MedCalc version number is 22.002 (you can download it here ).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.Numerator: the observed number of events in each group. This form allows to compare the rates in two groups. Files saved in all previous MedCalc versions can be read by this version but when saved, the new file format is used. Important: files saved in MedCalc version 22 cannot be read by previous MedCalc versions. Version 22 introduces a new file format. A rate is a ratio between a count and another measurement, for example the ratio of a number of events observed and the total number of person-years of observation. What's new in this version: MedCalc 22.001.
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