Fig. 2
MMSE of patients at different time points during the study period. MMSE values are reported separately for the low-dose group (red dots) versus the high-dose group (black squares), and data are expressed as medians (interquartile spacing). MMSE, Mini-Mental State Examination; T0, on preoperative 1 day; T1, on postoperative 2 days; T2, on postoperative 7 days; T3, on postoperative 14 days; T4, on postoperative 28 days