Table 1 Patient baseline demographic and clinical characteristics

Age (year)

66.47 ± 8.28

66.43 ± 7.69

Male: Female

14:18

16:16

Body mass index (kg/m2)

32.39 ± 3.73

34.15 ± 5.02

American Society of Anesthesiologists classification

2.03 ± 0.14

1.79 ± 0.26

hemoglobin (g/l)

11.26 ± 1.60

10.97 ± 1.19

Red blood cell(10¹²/l)

3.72 ± 0.75

4.05 ± 1.04

prothrombin time(s)

11.51 ± 3.51

11.85 ± 4.62