Table 3 Variance component analyses of nerve conduction parameters for subjects with symptom grade > 2
From: Repeatability of nerve conduction measurements derived entirely by computer methods
| Â | Â | Â | Standard | Standard Deviation | Coefficient of Variation | ||||
|---|---|---|---|---|---|---|---|---|---|
Parameter | Count | Mean | Deviation | Nerve | Session | Test | Session | Test | Session-Test |
Latency | |||||||||
DML | 345 | 3.62 | 0.95 | 0.34 | 0.31 | 0.12 | 8.7% | 3.3% | 9.3% |
Latency Elbow | 168 | 7.93 | 1.56 | 0.48 | 0.48 | 0.05 | 6.0% | 0.7% | 6.0% |
DSL | 246 | 3.48 | 0.94 | 0.47 | 0.42 | 0.22 | 12.0% | 6.2% | 13.5% |
Conduction Velocity (CV) | |||||||||
Ulnar CV Elbow | 80 | 48.49 | 7.18 | 2.94 | 2.8 | 0.91 | 5.8% | 1.9% | 6.1% |
Sural CV | 73 | 35.59 | 4.49 | 2.1 | 1.93 | 0.82 | 5.4% | 2.3% | 5.9% |
F-wave Latency (FWL), All Nerves | |||||||||
Mean FWL | 311 | 40.58 | 13.17 | 2.14 | 1.37 | 1.64 | 3.4% | 4.0% | 5.3% |
Minimum FWL | 301 | 38.38 | 12.59 | 2.28 | 1.42 | 1.78 | 3.7% | 4.6% | 5.9% |
Maximum FWL | 301 | 42.73 | 14.06 | 2.2 | 0.4 | 2.16 | 0.9% | 5.1% | 5.1% |
Median/Ulnar Nerve FWL | |||||||||
Mean FWL | 163 | 29.33 | 3.86 | 1.27 | 1.01 | 0.78 | 3.4% | 2.7% | 4.3% |
Minimum FWL | 163 | 28.15 | 3.51 | 1.34 | 1.12 | 0.73 | 4.0% | 2.6% | 4.8% |
Maximum FWL | 163 | 31.27 | 4.51 | 2.02 | 1.26 | 1.58 | 4.0% | 5.0% | 6.4% |
Peroneal/Tibial Nerve FWL | |||||||||
Mean FWL | 148 | 52.97 | 7.37 | 2.79 | 1.62 | 2.28 | 3.1% | 4.3% | 5.3% |
Minimum FWL | 138 | 50.46 | 7.83 | 3.07 | 1.67 | 2.57 | 3.3% | 5.1% | 6.1% |
Maximum FWL | 138 | 56.26 | 8.26 | 2.53 | 0 | 2.53 | 0.0% | 4.5% | 4.5% |
Amplitude | |||||||||
CMAP Amplitude | 345 | 5.15 | 2.86 | 0.74 | 0.7 | 0.25 | 13.5% | 4.8% | 14.3% |
CMAP Amplitude Elbow | 168 | 5.16 | 1.89 | 0.72 | 0.67 | 0.26 | 13.0% | 5.0% | 13.9% |
SNAP Amplitude | 255 | 24.61 | 21.73 | 5.85 | 5.42 | 2.22 | 22.0% | 9.0% | 23.8% |