Table 3 Intraoperative and postoperative conditions of all participants

N

59

89

88

74

52

40

Number of vertebral levels fused

6.99 ± 2.11

7.38 ± 1.99

0.691

8.99 ± 2.11

8.28 ± 1.99

0.701

12.01 ± 2.54

12.56 ± 2.01

0.595

Osteotomy pattern

0.121

0.073

0.091

Fusion without osteotomy, n

56

84

70

59

33

27

Smith-Peterson osteotomy, n

3

5

13

10

9

7

Ponte osteotomy, n

0

0

5

5

9

6

Duration of the surgery, h

6.10 ± 1.03

6.34 ± 1.65

0.495

6.54 ± 2.34

6.16 ± 1.76

0.426

8.10 ± 1.96

8.50 ± 2.44

0.546

Total fluid infusion, ml

2375.00 ± 478.63

2456.11 ± 593.59

0.433

2935.71 ± 789.03

3036.11 ± 542.13

0.547

3900.00 ± 762.56

3806.25 ± 1267.55

0.411

Total plasma infusion, ml

166.66 ± 182.51

155.55 ± 127.13

0.756

244.44 ± 158.91

257.14 ± 209.03

0.758

320.00 ± 163.29

350.00 ± 223.60

0.605

Urine volume, ml

833.33 ± 258.75

922.22 ± 431.11

0.314

900.00 ± 293.87

885.71 ± 299.15

0.831

1180.00 ± 394.75

1325.00 ± 443.52

0.252

Volume of intraoperative blood loss, ml

700.00 ± 83.04

711.11 ± 148.43

0.710

1155.55 ± 117.85

1171.42 ± 89.34

0.651

1780.00 ± 208.16

1750.00 ± 170.13

0.605

Volume of autologous blood transfused, ml

240.00 ± 41.52

/

405.55 ± 107.77

/

640.00 ± 122.47

/

Volume of allogeneic RBC transfused, unit

During operation

2.66 ± 0.95

3.00 ± 1.16

0.198

3.55 ± 1.27

4.28 ± 0.71

0.003*

5.00 ± 2.04

8.50 ± 1.70

< 0.001*

Day 1 postoperation

1.07 ± 0.35

1.11 ± 0.43

0.089

1.37 ± 0.68

2.01 ± 0.76

0.022*

2.14 ± 1.05

2.98 ± 0.99

0.017*

Day 2 postoperation

0.77 ± 0.21

0.82 ± 0.11

0.372

1.00 ± 0.46

1.09 ± 0.67

0.476

1.27 ± 0.76

1.30 ± 0.86

0.099

Volume of drainage, ml

Day 1 postoperation

199.44 ± 17.56

202.49 ± 21.12

0.781

358.75 ± 24.21

367.78 ± 19.68

0.088

555.76 ± 38.87

579.01 ± 54.42

0.081

Day 2 postoperation

69.67 ± 11.24

73.78 ± 15.56

0.356

145.76 ± 14.86

157.81 ± 15.62

0.101

203.65 ± 19.77

211.57 ± 14.99

0.077

Hemoglobin, g/dL

Day 1 postoperation

11.78 ± 1.60

11.46 ± 0.98

0.601

11.71 ± 1.76

11.52 ± 1.13

0.596

12.16 ± 1.65

11.80 ± 1.65

0.473

Day 2 postoperation

10.63 ± 1.02

10.86 ± 0.89

0.441

10.60 ± 1.44

10.33 ± 1.27

0.643

10.97 ± 1.45

10.90 ± 1.47

0.771

Discharge

12.35 ± 1.12

12.23 ± 1.26

0.441

12.53 ± 1.10

12.70 ± 0.55

0.145

12.85 ± 1.20

13.21 ± 0.67

0.074

Hematocrit, %

Day 1 postoperation

35.37 + 3.15

34.81 + 4.72

0.211

30.07 ± 3.56

29.57 ± 3.34

0.279

26.33 ± 4.86

23.67 ± 3.23

0.069

Day 2 postoperation

33.23 + 2.37

31.828 + 3.45

0.175

27.72 ± 4.17

27.54 ± 3.73

0.614

26.32 ± 3.89

24.96 ± 4.59

0.409

Discharge

38.62 ± 3.52

38.31 ± 2.00

0.713

39.00 ± 0.42

38.26 ± 4.50

0.531

38.27 ± 1.71

38.77 ± 3.37

0.351