TABLE 2.

The demographics data of the control and test groups.

Demographics of patients	Control group (n = 20)	Test group (n = 72)	P-value
Gender (male/female)	13/7	43/29	0.669
Age (years)	70.45 ± 3.15	71.15 ± 5.95	0.853
Years of education	6.55 ± 2.38	6.53 ± 2.75	0.753
BMI (kg⋅m–2)	23.98 ± 2.95	24.31 ± 2.94	0.355
MMSE scores 1 day before surgery	28.70 ± 1.03	26.90 ± 1.54	0.051
CTT scores 1 day before surgery	35.90 ± 3.46	36.28 ± 5.49	0.937
DST scores 1 day before surgery	7.76 ± 1.64	7.71 ± 1.46	0.984
CDT scores 1 day before surgery	3.62 ± 0.50	3.19 ± 0.57	0.228
VFT scores 1 day before surgery	26.81 ± 3.70	28.82 ± 4.22	0.054

BMI, body mass index; MMSE, Mini-Mental State Examination; CTT, Color Trail Test; DST, Digit Span Test; CDT, Clock Drawing Test; VFT, Verbal Fluency Test.