Table 2 Patient Baseline of Clinical Characteristics

Pseudoclaudication: any^b

62

15

0.13

SLR or femoral tension^b

20

8

0.51

Course of disease: yr^c

3.2 ± 2.6

3.5 ± 3.1

0.64

Pain radiation: any^b

57

18

0.88

Any neurological deficit

 Reflexes: asymmetric depressed^a

32

4

0.03

 Sensory: asymmetric decrease^a

43

5

0.02

Motor: asymmetric weakness^a

34

4

0.02

VAS improvement rate after SNRB^a

0.01

 ≤24 %

8

7

 25 ~ 49 %

37

9

 50 ~ 74 %

21

3

 ≥75 %

5

6

ODI improvement rate after SNRB^a

0.13

 ≤24 %

20

6

 25 ~ 49 %

45

9

 50 ~ 74 %

12

6

 ≥75 %

4

4

VAS score before operation^a

0.01

 ≤2

12

9

 3 ~ 5

23

8

 5 ~ 7

27

4

 ≥8

19

4

ODI before operation^a

0.32

 ≤24 %

25

6

 25 ~ 49 %

33

7

 50 ~ 74 %

18

9

 ≥75 %

5

3

X-ray of lumbar vertebra

 Degenerative scoliosisb^b

25

7

0.79

 Lumbar lordosis disappear^b

72

19

0.19

 Degenerative lumbar instability^b

28

6

0.32

Stenosis level

 L1-L2^a

10

4

0.74

 L2-L3^a

17

4

0.78

 L3-L4^b

59

15

0.22

 L4-L5^a

78

17

0.02

 L5-S1^b

32

4

0.03

Total number of stenosis^a

0.72

 Two

13

5

 Three

36

9

 More than 3

32

11

Stenosis locations

 Central or Lateral recess^b

71

18

0.11

 Neuroforamen

21

5

0.03

Stenosis severity^b

0.55

 Mild

25

8

 Moderate

35

13

 Severe

21

4