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

From: A valid model for predicting responsible nerve roots in lumbar degenerative disease with diagnostic doubt

Variable Construction sample Validation sample P-value Adj. OR (95 % CI) P-value
(n = 106) (n = 57)
n (%)/x ± s n (%)/x ± s
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    
  1. indicates significant difference, LDD lumbar degenerative disease, SNRB selective nerve root block, N/M not in the model, Adj. OR adjusted odds ratio, CI confidence interval, VAS Visual analog scale