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Table 3 Measurements of MUNIX detection and clinical function measures in both SCI patient and normal control groups

From: Motor unit number index detects the effectiveness of surgical treatment in improving distal motor neuron loss in patients with incomplete cervical spinal cord injury

  Early surgical treatment group Delayed surgical treatment group Healthy subjects
Number of subjects 17 30 34
Age range (years) 45.0 ± 12.2 47.4 ± 13.1 44.0 ± 11.1
Height range (cm) 164.7 ± 8.9 165.9 ± 9.2 166.9 ± 5.7
  Left side Right side Left side Right side Left side Right side
MUNIX detection
 CMAP-AH 14.0 ± 4.7 14.1 ± 4.8 13.4 ± 4.7 13.3 ± 4.5 14.6 ± 4.9 14.2 ± 5.0
 MUNIX-AH 218.4 ± 108.3 213.6 ± 106.0 195.9 ± 97.5 192.8 ± 96.0 240.8 ± 96.8 240.4 ± 103.5
 MUSIX-AH 71.5 ± 20.3 74.8 ± 24.2* 76.8 ± 14.1* 77.1 ± 14.9* 63.0 ± 12.5 62.7 ± 13.7
 CMAP-TA 6.1 ± 1.3 6.1 ± 1.1 5.9 ± 1.8 5.9 ± 1.5 6.5 ± 1.0 6.5 ± 1.0
 MUNIX-TA 117.3 ± 41.9 113.4 ± 45.6# 95.3 ± 38.2* 89.6 ± 37.2*# 122.9 ± 31.7 119.6 ± 30.8
 MUSIX-TA 58.1 ± 20.3# 61.1 ± 22.2# 70.6 ± 15.6*# 75.7 ± 20.5*# 55.2 ± 10.4 56.4 ± 11.3
 CMAP-EDB 5.6 ± 2.2 5.6 ± 2.3 5.0 ± 2.0* 5.0 ± 2.0 6.0 ± 1.5 5.9 ± 1.9
 MUNIX-EDB 86.9 ± 42.8 84.3 ± 44.0# 69.6 ± 37.4* 60.4 ± 28.5*# 94.8 ± 30.1 94.7 ± 34.4
 MUSIX-EDB 73.8 ± 19.2# 76.7 ± 18.3*# 87.7 ± 30.2*# 92.9 ± 20.0*# 65.2 ± 13.6 63.7 ± 12.2
Clinical function measures
 MRC-AH 4.2 ± 1.0 4.2 ± 1.0 4.1 ± 0.8 4.2 ± 1.0 / /
 MRC-TA 3.9 ± 1.2 4.0 ± 1.1 3.9 ± 1.0 3.9 ± 1.0   
 MRC-EDB 3.8 ± 1.3 3.7 ± 1.2 3.7 ± 1.0 3.7 ± 1.0 / /
 ASIA motor score 81.4 ± 15.2 78.6 ± 18.3 /
  1. SCI Spinal cord injury, MUNIX Motor unit number index, CMAP Compound muscle action potential, MUSIX Motor unit size index, TA tibialis anterior, AH abductor hallucis, EDB Extensor digitorum brevis, MRC Medical research council score, ASIA American spinal injury association
  2. * Statistical difference between the patient and control groups, P < 0.05
  3. # Statistical difference between the early and delayed surgical treatment groups, P < 0.05