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Table 3 Nerve conduction study of patients

From: Impact of vitamin D level in diabetic people with peripheral neuropathy

Item Group A (n = 20) Group B (n = 20) Group C (n = 20) Group D (n = 20)
  n % n % n % n %
Lower limb nerves
 Absent sural SNAP 20 100 20 100 20 100 0 0
Peroneal CMAP
 Normal 12 60 0 0 0 0 20 100
 Reduced 7 35 10 50 5 25 0  
 Absent 1 5 10 50 15 75 0  
Tibial CMAP
 Normal 16 80 5 25 3 15 20 100
 Reduced 4 20 11 55 8 40 0  
 Absent 0 0 4 20 9 45 0  
Upper limb nerves
 Median CMAP
  Normal 17 85 13 65 11 55 20 100
  Reduced 3 15 7 35 9 45   
 Ulnar CMAP
  Normal 19 95 18 90 15 75 20 100
  Reduced 1 5 2 10 5 25   
Affected median SNAP 3 15 4 20 4 20 1 5
Affected ulnar SNAP 1 5 3 15 3 15 0 100
  1. SNAP: sensory nerve action potential; CMAP: compound motor action potential