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Table 2 Maximum BLR for which CP of at least 90% is reached for interval estimation of IDR as approximation of the HR

From: Limitations of the incidence density ratio as approximation of the hazard ratio

Relative average follow-up time of the control group Maximum BLR
Weibull (decreasing hazard) Gompertz (increasing hazard)
α = 0.5 α = 0.75 α = 1
30% 1%
40% 1%
50% 1% 2% 1%
60% 2% 2% 1% 1%
70% 7.5% 5% 2% 1%
80% 30% 10% 2% 2%
90% 30% 30% 20% 10%
100% 30% 30% 30% 25%
  1. Total sample size N = 1000
  2. BLR baseline risk, CP coverage probability, HR hazard ratio, IDR incidence density ratio