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). 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). 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). 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).
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