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Table 1 Means and standard deviations for age, symptoms duration, soleus H-reflex amplitudes in millivolts (mV), soleus H-reflex latencies in millisecond (ms), soleus side-to-side amplitude H/H ratios, soleus side-to-side latency differences of all participants

From: H-reflex amplitude asymmetry is an earlier sign of nerve root involvement than latency in patients with S1 radiculopathy

   Healthy controls Patients with normal latency Patients with abnormal latency  
   Mean (SD) Mean (SD) Mean (SD) P-value
Age   39.6 (12.4) 46.2 (12.3) 45.8 (14.4)  
Amplitude (mV) Right or Symptomatic 5.98 (2.21) 3.95 (2.34) 2.37 (1.88)  
  Left or Asymptomatic 6.02 (2.03) 5.22 (2.75) 4.0 (2.34)  
Latency (ms) Right or Symptomatic 29.98 (2.7)† 31.44 (2.69) 32.93 (2.82)† .0005*
  Left or Asymptomatic 30.04 (2.6) 31.35 (2.72) 31.87 (2.74)  
H/H ratio   0.83 (0.11)‡§ 0.67 (0.12)‡ 0.54 (0.14)§ .0005*
Latency differences   0.12 (0.03) 0.31 (0.1) 1.36 (0.65)  
Duration of symptoms (days)   N/A 31.0 (8.6) 57.0 (8.2)††  
  1. * Indicates significant differences (p < .05) for the soleus H-reflex parameters between groups using ANCOVA.
  2. ‡ Indicates significant differences (p < .05) between healthy controls and patients with normal latency for H/H ratio using Boferroni correction.
  3. § Indicates significant differences (p < .05) between healthy controls and patients with abnormal latency for H/H ratio using Boferroni correction.
  4. † Indicates significant differences (p < .05) between healthy controls and patients with abnormal latency for latency parameter using Boferroni correction.
  5. †† Indicates significant correlation between amplitude asymmetries and symptoms duration.