Table 5 Nerve conduction measurements.
From: Nerve conduction in relation to vibration exposure - a non-positive cohort study
Exposed | Unexposed | 95% CI Group difference (Exposed [all] - Unexposed) | p-value* | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
All | Formerly | Currently | |||||||||
Mean | SD | Mean | SD | Mean | SD | Mean | SD | ||||
Motor examination | |||||||||||
Median nerve | |||||||||||
Velocity (m/s) | right | 57.8 | 5.36 | 58.5 | 5.29 | 56.8 | 5.46 | 57.6 | 6.03 | -1.96; 2.43 | 0.83 |
left | 60.4 | 6.08 | 61.0 | 6.16 | 59.8 | 5.68 | 61.1 | 7.02 | -3.44; 2.01 | 0.60 | |
Amplitude (wrist) (mV) | right | 7.61 | 3.28 | 7.48 | 2.82 | 7.83 | 3.92 | 8.14 | 3.26 | -1.74; 0.69 | 0.39 |
left | 8.95 | 3.42 | 8.94 | 3.38 | 8.8 | 3.52 | 7.70 | 3.40 | -0.08; 2.57 | 0.06 | |
Distal latency (ms) | right | 4.42 | 0.73 | 4.40 | 0.67 | 4.41 | 0.83 | 4.28 | 0.65 | -0.11; 0.39 | 0.28 |
left | 4.07 | 0.53 | 4.09 | 0.48 | 4.07 | 0.63 | 4.04 | 0.71 | -0.23; 0.30 | 0.79 | |
F-latency (ms) | right | 25.9 | 2.08 | 25.7 | 1.87 | 26.2 | 2.37 | 26.5 | 2.11 | -1.37; 0.23 | 0.16 |
left | 25.8 | 2.11 | 25.7 | 2.07 | 25.8 | 2.16 | 25.5 | 2.04 | -0.50; 1.10 | 0.46 | |
Ulnar nerve | |||||||||||
Velocity (m/s) | right | 60.4 | 7.06 | 60.4 | 6.8 | 60.4 | 7.55 | 59.7 | 6.47 | -1.83; 3.23 | 0.58 |
left | 64.0 | 6.52 | 63.8 | 6.82 | 64.2 | 6.19 | 63.5 | 6.39 | -2.07; 2.97 | 0.72 | |
Amplitude (wrist) (mV) | right | 11.2 | 2.30 | 11.2 | 2.49 | 11.3 | 2.01 | 11.2 | 2.18 | -0.81; 0.86 | 0.95 |
left | 10.4 | 1.99 | 10.4 | 2.04 | 10.3 | 1.94 | 10.4 | 2.20 | -0.85; 0.82 | 0.98 | |
Distal latency (ms) | right | 3.36 | 0.46 | 3.35 | 0.43 | 3.37 | 0.51 | 3.38 | 0.41 | -0.19; 0.13 | 0.73 |
left | 3.27 | 0.45 | 3.29 | 0.48 | 3.25 | 0.42 | 3.24 | 0.43 | -0.14; 0.20 | 0.71 | |
F-latency (ms) | right | 26.9 | 2.26 | 26.9 | 2.08 | 26.9 | 2.54 | 27.3 | 1.81 | -1.20; 0.25 | 0.20 |
left | 26.4 | 2.21 | 26.5 | 2.16 | 26.2 | 2.33 | 26.4 | 2.26 | -0.93; 0.81 | 0.89 | |
Sensory examination | |||||||||||
Median nerve | |||||||||||
Latency, dig III-palm (ms) | right | 1.74 | 0.20 | 1.72 | 0.21 | 1.75 | 0.20 | 1.78 | 0.23 | -0.15; 0.06 | 0.36 |
left | 1.71 | 0.19 | 1.71 | 0.21 | 1.71 | 0.15 | 1.74 | 0.27 | -0.15; 0.09 | 0.63 | |
Amplitude (finger) (μV) | right | 15.6 | 8.49 | 15.9 | 8.37 | 15.2 | 8.87 | 11.8 | 9.86 | -0.56; 8.18 | 0.09 |
left | 17.8 | 10.5 | 18.6 | 11.5 | 16.9 | 9.38 | 15.8 | 9.07 | -2.40; 6.43 | 0.36 | |
Latency, palm-wrist (ms) | right | 1.58 | 0.26 | 1.54 | 0.24 | 1.61 | 0.29 | 1.64 | 0.43 | -0.25; 0.11 | 0.45 |
left | 1.50 | 0.23 | 1.45 | 0.21 | 1.54 | 0.25 | 1.48 | 0.18 | -0.07; 0.11 | 0.67 | |
Amplitude (wrist) (μV) | right | 12.6 | 7.47 | 12.8 | 6.65 | 12.5 | 8.61 | 8.05 | 6.49 | 1.51; 7.60 | 0.004 |
left | 13.1 | 8.27 | 13.6 | 8.24 | 12.8 | 8.35 | 10.6 | 5.92 | -0.58; 5.54 | 0.11 | |