Table 3 Descriptive characteristics and analysis for determining responsible nerve roots of LDD patients with diagnostic doubt in both construction and validation samples

ECO

81

43

0.889

N/M

N/M

VAS score before operation^▲

0.210

1.56 (1.08–2.65)

0.001

 ≤2

21

9

 3 ~ 5

31

12

 5 ~ 7

41

15

 ≥8

23

21

Stenosis level

1.44 (1.10–1.89)

0.04

 L1-L2^▲

14

5

0.400

 L2-L3^▲

21

6

0.128

 L3-L4^▲

64

27

0.111

 L4-L5^▲

92

44

0.116

 L5-S1^▲

36

12

0.085

Stenosis locations

1.95 (1.32–3.51)

0.01

 Central^▲

73

36

0.460

 Lateral recess^▲

82

49

0.130

 Neuroforamen^▲

29

14

0.250

Neurological deficit

1.62 (1.02–2.79)

0.01

 Reflexes: asymmetric depressed^▲

36

16

0.442

 Sensory: asymmetric decrease^▲

48

19

0.139

 Motor: asymmetric weakness^▲

38

23

0.571

VAS score improvement after SNRB^▲

0.762

3.42 (1.27–7.64)

0.02

 ≤24 %

15

9

 25 ~ 49 %

46

25

 50 ~ 74 %

24

13

 ≥75 %

11

10