Table 4 Surgical data

Location of the lesion

 Lumbar spine

15

8

0.151

 Thoracic spine

4

7

Number of decompression segment

 1

15

14

0.355

 2

4

1

Preoperative embolism

 Yes

2

2

1.000

 No

17

13

Dural tear

 Yes

0

2

0.187

 No

19

13

Operative time (min)

278.7 ± 9.6

254.5 ± 16.6

0.194

Blood loss(ml): Gross equation

1571.9 ± 97.4

1192.3 ± 183.2

0.061

Intraoperative blood transfusion (ml)

673.7 ± 68.8

480.0 ± 97.2

0.104

Drainage: Amount (ml)

364.5 ± 64.2

133.5 ± 30.9

0.003

Drainage: Time (day)

4.6 ± 0.5

3.1 ± 0.2

0.019

Postoperative hospitalization (day)

10.3 ± 2.4

9.0 ± 0.9

0.640