Pre- and intraoperative data
The demographic and clinical variables were comparable between the two groups (Table 
Demographic and intraoperative dataStudent’s t test or Mann―Whitney U test for continuous variables; Fisher’s exact or χ2 tests for categorical variables and proportionsASA, American Society of Anesthesiologist; BMI, body mass index; MMSE, Mini-mental state examination; n, number; SD, standard deviation
Hemodynamic parametersUpon entry into theoperating room (T1)Upon entry into theoperating room (T1)Student’s t test for continuous variables; HR: heart rate; MAP, mean arterial pressure; n, number; SD, standard deviation