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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.