Fig. 2
From: Meta-analysis with zero-event studies: a comparative study with application to COVID-19 data
Comparison of the four CIs of RR with p2=0.05, 0.15, 0.85 or 0.95, and n1=n2=50. The dot-dashed lines represent the simulation results of the Haldane interval, the dashed lines represent the simulation results of the Carter interval, the dotted lines represent the simulation results of the Pettigrew interval, and the solid lines represent the simulation results of the hybrid interval. CI: Confidence interval, RR: Relative risk