## 3 Results  
Overall, patients reported pain on the VAS from 0 to 5 with an average of 1.78 \(\pm\) 1.0 (see Table 2); it was the most increased (an average of 3.0) in C3-C5 patient groups and the least (an average of 0.9) in Th7-L1 group. Analysis of the ENG results indicated more moderate than severe scores of the abnormality in the peripheral motor transmission of neural impulses in fibres of upper and lower extremities nerves. Similarly, as in VAS results, they were the most increased at 2.1 on average in patients from the C3-C5 group and the least at 1.3 on average in the Th7-L1 group. Considering clinical and neurophysiological results recorded in all iSCI patients, we found significant differences for all measured parameters at \(p\) = 0.01 for the MAS score and at \(p\) = 0.02 for the Lovett Scale results (Table 3). Neurophysiological studies provided evidence of much more greatest differences, especially for the parameters of rsEMG amplitudes at \(p\) = 0.009 and mcsEMG amplitudes at \(p\) = 0.008, indicating the pathological function of muscle motor units in comparison to the healthy subjects. Considering the parameter of mcsEMG of motor units firing frequency (FI), the differences were the most significant (at \(p\) = 0.03) in recordings from lower extremity muscles, the least from APB muscles. Analysing the results recorded in certain groups of patients with injuries at different levels of the spinal cord in comparison to the healthy subjects, the highest MAS and rsEMG values, as well as the lowest Lovett Scale and mcsEMG scores, were found in C3-C5 iSCI patients in most of the key muscles. Patients with Th7-L1 injuries represented moderate MAS and rsEMG results, while the muscle strength and motor units' activity appeared to be the worst in the extensor digitorum brevis muscle (see Figure 1F). Patients with Th3-Th6 incomplete injuries generally presented a moderate level of muscle pathology compared to the above groups (Table 4; see an example in Figure 1E). The graphical presentation of the measured parameters' variability is shown in the charts in Figure 2. In general, the results of all parameters from clinical and neurophysiological studies are statistically different from the normative recorded in the control groups, but the least in recordings from APB muscles in patients from the Th3-Th6 and Th7-L1 groups. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Subjects** & **Injury Level** & **VAS Score (0–10)** & **ENG Score (0–3)** \\ \hline \multirow{3}{*}{Patients N = 85 \(\gamma\)= 19, \(\sigma\)= 66 \(\gamma\)= 17, \(\sigma\)= 63 & C3–C5 = 16 & 0–5 3.0 \(\pm\) 1.6 & 1–3 2.1 \(\pm\) 0.9 \\  & C6–Th1 = 19 & 0–3 1.9 \(\pm\) 0.9 & 0–3 1.5 \(\pm\) 0.9 \\ \cline{1-1}  & Th3–Th6 = 18 & 0–3 1.3 \(\pm\) 0.9 & 0–3 1.7 \(\pm\) 1.0 \\ \cline{1-1}  & Th7–L1 = 32 & 0–2 0.9 \(\pm\) 0.7 & 0–3 1.3 \(\pm\) 0.8 \\ \hline \multirow{3}{*}{Control N = 80 \(\gamma\)= 17, \(\sigma\)= 63} & \multirow{3}{*}{NA} & \multirow{3}{*}{0–0 0} & \multirow{3}{*}{3–3 3.0} \\ \cline{1-1}  & & & \\ \cline{1-1}  & NA & & \\ \hline \hline \end{tabular} Abbreviations: \(p<0.05\) determines significant statistical differences marked bold; NA—non-applicable; VAS—visual analogue scale (0—no pain, 1–3—mild pain, 4–6—moderate pain, 7–10—severe pain); ENG—electroneurographical evaluation of impulses transmission in motor fibres (0—no transmission; 1—severe abnormalities; 2—moderate abnormalities; 3—normal transmission).  
\end{table} 
Table 2: Comparison of the results of pain and electroneurographical assessment in healthy volunteers and iSCI patients. Minimum, maximum, mean values and standard deviations are presented.