Inversion of the F-waves in Median Neuropathy at the Wrist (Carpal Tunnel Syndrome)

Table 6 Control Data Controls

             95% C.L.
  n Range    Mean  S.D. (lower) (upper) 
 Side-to-side difference (median F-wave) 30 ­2.1 1.9  ­0.01  0.92   ­1.81  1.79
 Side-to-side difference (ulnar F-wave) 30 ­1.9 1.9 ­0.03  0.77  ­1.54  1.48
 Left F-wave MLD* (median-ulnar) 30 ­2.5  0.5  ­0.74  0.76  ­2.23 0.75 
 Right F-wave MLD* (median-ulnar) 30 ­2.3  0.5 ­0.72  0.60  ­1.90  0.46 
MLD represents the F-wave minimum-latency difference. Combining right and left MLD yields an upper limit of normal of 0.98 msec (Mean, +2.5 S.D.)