Table 1 Baseline characteristics and preoperative data of the study population

Male/Female

43/43

43/42

>0.99

Age(years)

51±12

48±14

0.29

Height(cm)

165.3±7.8

166.2±7.1

0.41

Weight(kg)

67.8±11.5

68.3±11.2

0.73

Hemoglobin(g/L)

145.4±13.7

142.6±21.6

0.32

Glucose(mmol/L)

5.74±1.7

5.89±0.8

0.11

ASA I/II

7/79

11/74

0.33

Diagnosis

Thoracic

24

29

0.41

Meningioma

8

11

0.47

Ependymoma

3

2

0.99

Gliomas

2

3

0.68

Teratoma

1

0

0.99

Neurofibroma

6

9

0.43

Hemangioblastoma

2

1

0.99

Thoracic spinal stenosis

2

3

0.68

Lumbar

62

56

0.41

Meningioma

11

13

0.66

Ependymoma

8

7

0.99

Gliomas

5

6

0.99

Neurofibroma

9

7

0.79

Hemangioblastoma

1

2

0.62

Tethered cord

6

4

0.74

Lipoma

2

1

0.99

Lumbar disk herniation

5

4

0.99

Lumbar spinal stenosis

15

12

0.68

Blood loss(mL)

236±36

280±39

0.13

Fluid infusion volume(mL)

2386±154

2381±142

0.68

Operation time(hours)

4.4±1.7

4.1±1.4

0.16