Table 1 Baseline patient characteristics after PSM

Number

540

540

/

Age (y), mean ± SD

23.66 ± 4.37

23.55 ± 4.27

0.694

Height (cm), mean ± SD

166.30 ± 8.52

166.49 ± 8.31

0.699

Weight (kg), mean ± SD

59.20 ± 11.09

59.20 ± 11.58

0.993

Gender (M/F)

188/352

190/350

0.899

Preoperative haemoglobin (g/L), mean ± SD

128.92 ± 14.67

128.82 ± 14.91

0.915

PLT (× 10⁹/L), mean ± SD

240.25 ± 47.93

241.29 ± 54.16

0.739

PT (s), mean ± SD

11.39 ± 0.93

11.37 ± 0.81

0.660

APTT (s), mean ± SD

28.36 ± 2.38

28.17 ± 2.39

0.174

ANH(mL), mean ± SD

353.51 ± 128.23

352.22 ± 139.49

0.874

Patients with ANH/patients without ANH

496/44

490/50

0.517

Preoperative MAP (mmHg)

86.47 ± 8.40

86.68 ± 8.55

0.681

Preoperative HR (bpm)

80.80 ± 9.41

81.03 ± 10.04

0.711

BIS

17.70 ± 4.99

17.64 ± 4.95

0.854

Crystalloid fluids (mL)

2780.46 ± 520.06

2804.81 ± 555.07

0.457

colloid fluids (mL)

388.89 ± 350.81

387.96 ± 372.95

0.966