Table 7.

MMSE scores measured at different time points.

Variable	Time points	S group	SD group	P values
MMES	Before surgery 1d	28.3 ± 1.3	28.5 ± 1.2	0.329
	After surgery 1d	24.6 ± 1.3	25.2 ± 1.1a	0.003
	After surgery 2d	25.0 ± 1.1	25.6 ± 1.1a	0.002
	After surgery 7d	26.7 ± 1.2	27.4 ± 1.3a	0.001

Data are expressed as means ± SD.

MMSE, mini–mental status examination.

^aP < 0.05 VS S group.