Fig. 3From: Remifentanil requirement for i-gel insertion is reduced in male patients with Parkinson’s disease undergoing deep brain stimulator implantation: an up-and-down sequential allocation trialDose–response curve from the probit analysis. PD, Parkinson’s disease; NPD, non-Parkinson’s disease. The shaded areas indicate the confidence intervals of the EC50 (blue for PD group, green for NPD group)Back to article page