|  | Healthy controls | Patients with normal latency | Patients with abnormal latency |  |
---|---|---|---|---|---|
 |  | Mean (SD) | Mean (SD) | Mean (SD) | P-value |
Age | Â | 39.6 (12.4) | 46.2 (12.3) | 45.8 (14.4) | Â |
Amplitude (mV) | Right or Symptomatic | 5.98 (2.21) | 3.95 (2.34) | 2.37 (1.88) | Â |
 | 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 | Â | 0.12 (0.03) | 0.31 (0.1) | 1.36 (0.65) | Â |
Duration of symptoms (days) |  | N/A | 31.0 (8.6) | 57.0 (8.2)††|  |