Fig. 4
Vital sign changes during anesthesia induction. SpO2, saturation of percutaneous oxygen; mBP, mean blood pressure; HR, heart rate; PSi, patient state index. Data were analyzed using a repeated measures general linear model. * p < 0.05 compared with Ventilation group; ** p < 0.005 compared with Ventilation group; † p < 0.05 compared with ‘Initial’ in Ventilation group; ‡ p < 0.05 compared with ‘Initial’ in Apnea group