Table 2 Patient demographic and clinical characteristics

 Age (y)

70 ± 7

67 (62,72)

0.07

 Gender, male (n [%])

25 (69.5)

94 (67.6)

0.84

 BMI (kg/m)

24.9 ± 3.4

24.5 ± 3.4

0.59

 Educational level (y)

9 (6, 9)

9 (6, 12)

0.30

 Hypertension, n (%)

16 (44.4)

61 (43.9)

0.95

 Diabetes mellitus, n (%)

5 (13.9)

17 (12.2)

1.00

 Coronary heart disease, n (%)

2 (5.6)

20 (14.4)

0.25

 History of cerebral infarction, n (%)

5 (13.9)

10 (7.2)

0.35

 Smoking, n (%)

6 (16.7)

30 (21.6)

0.52

 Drinking, n (%)

4 (11.1)

15 (10.8)

1.00

Hb (g/L)

133 ± 14

131 ± 17

0.51

TG (mmol/L)

4.5 (3.5, 5.1)

5.2 ± 1.2

0.07

TC (mmol/L)

1.0 (0.8, 1.6)

1.2 (0.9, 1.7)

0.44

Operation types

0.53

 Orthopedic procedures, n (%)

11 (30.6)

35 (25.2)

0.51

 Gastrointestinal surgery, n (%)

8 (22.2)

44 (31.7)

0.27

 Urological surgery, n (%)

17 (47.2)

60 (43.2)

0.66

Total fluid administration

2000 (1525, 2438)

2000 (1700, 2500)

0.37

Intraoperative blood loss (mL)

100 (50, 275)

100 (50, 250)

0.46

Duration of anesthesia (min)

204 ± 72

180 (140, 240)

0.57

Duration of surgery (min)

172 ± 73

150 (115, 203)

0.52

Follow-up time (day)

7 (6, 10)

7 (6, 8)

0.17

MMSE (score)

26 (23, 29)

27 (24, 29)

0.06