Table 7 Variance component analyses of nerve conduction parameters (excluding category I-III outliers)
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 | 904 | 3.50 | 0.82 | 0.80 | 0.22 | 0.11 | 6.2% | 3.1% | 6.9% |
Latency Elbow | 450 | 7.65 | 1.43 | 1.39 | 0.35 | 0.06 | 4.5% | 0.8% | 4.6% |
DSL | 649 | 3.29 | 0.69 | 0.65 | 0.19 | 0.07 | 5.9% | 2.1% | 6.3% |
Conduction Velocity (CV) | |||||||||
Ulnar CV Elbow | 221 | 50.78 | 7.08 | 6.67 | 2.02 | 1.35 | 4.0% | 2.7% | 4.8% |
Sural CV | 200 | 37.12 | 3.80 | 3.45 | 1.59 | 0.75 | 4.3% | 2.0% | 4.7% |
F-wave Latency (FWL), All Nerves | |||||||||
Mean FWL | 832 | 40.15 | 12.86 | 13.15 | 0.96 | 1.41 | 2.4% | 3.5% | 4.2% |
Minimum FWL | 801 | 37.92 | 12.17 | 12.63 | 1.16 | 1.53 | 3.1% | 4.0% | 5.1% |
Maximum FWL | 801 | 42.41 | 14.13 | 14.51 | 0.03 | 2.19 | 0.1% | 5.2% | 5.2% |
Median/Ulnar Nerve FWL | |||||||||
Mean FWL | 421 | 28.50 | 3.14 | 2.97 | 0.64 | 0.71 | 2.3% | 2.5% | 3.4% |
Minimum FWL | 421 | 27.43 | 2.95 | 2.74 | 0.71 | 0.76 | 2.6% | 2.8% | 3.8% |
Maximum FWL | 421 | 30.29 | 3.63 | 3.27 | 0.82 | 1.34 | 2.7% | 4.4% | 5.2% |
Peroneal/Tibial Nerve FWL | |||||||||
Mean FWL | 411 | 52.09 | 6.54 | 6.63 | 1.16 | 1.88 | 2.2% | 3.6% | 4.2% |
Minimum FWL | 380 | 49.54 | 6.75 | 7.00 | 1.50 | 2.10 | 3.0% | 4.2% | 5.2% |
Maximum FWL | 380 | 55.84 | 7.92 | 7.77 | 0.00 | 2.79 | 0.0% | 5.0% | 5.0% |
Amplitude | |||||||||
CMAP Amplitude | 904 | 5.19 | 2.66 | 2.54 | 0.81 | 0.25 | 15.6% | 4.8% | 16.3% |
CMAP Amplitude Elbow | 450 | 5.65 | 1.97 | 1.77 | 0.83 | 0.29 | 14.8% | 5.1% | 15.6% |
SNAP Amplitude | 663 | 26.87 | 19.02 | 18.52 | 3.82 | 1.61 | 14.2% | 6.0% | 15.4% |