Table 1 Baseline characteristics of included patients

Age (years)

65.74 ± 11.19

64.06 ± 9.01

0.395

Gender (n/%)

0.852

 male

28

23

 female

34

26

Body mass index

26.02 ± 2.58

25.33 ± 1.04

0.083

Procedure Location

0.599

 L2/3

1

2

 L3/4

4

6

 L4/5

52

37

 L5/S1

5

4

Extent of stenosis

0.459

 B

5

7

 C

49

38

 D

8

4

Concomitant disease

0.930

 hypertension

26

21

 coronary disease

6

4

 diabetes

11

8

 cerebral infarction

3

1

 arthritis deformans

3

4

 osteoarthritis

11

7