Reference values for the sensory NCS parameters in the upper and the lower limbs.
| Nerve N | Age | Amplitude (µV) | Peak latency (ms)‡ | Conduction velocity (m/s) |
|---|---|---|---|---|
| 3rd percentile (LLN)† | 97th percentile (ULN) | 3rd percentile (LLN)† | ||
| Median sensory D2 | ||||
| 118 | 20 | 31 (24) | 3.5 (3.5) | 52 (52) |
| 40 | 27 (18) | |||
| 60 | 22 (13) | |||
| β0* | 3.613 (3.444) | |||
| β1* | − 0.008 (−0.014) | |||
| Ulnar sensory D5 | ||||
| 118 | 20 | 36 (24) | 3.5 (3.7) | 51 (50) |
| 40 | 21 (12) | |||
| 60 | 12 (6) | |||
| β0* | 4.124 (3.853) | |||
| β1* | −0.027 (−0.034) | |||
| Median D2-(minus) ulnar D5 PL difference | ||||
| 118 | 20–65 | — | 0.4 (0.4) | — |
| Median-(minus) ulnar D4 PL difference | ||||
| 109 | 20–65 | — | 0.4 (0.5) | — |
| Median-(minus) ulnar mixed palmar PL difference | ||||
| 100 | 20–65 | — | 0.3 (0.4) | — |
| Superficial radial sensory | ||||
| 111 | 20 | 29 (24) | 2.6 (2.7) | 53 (50) |
| 40 | 25 (20) | |||
| 60 | 22 (16) | |||
| β0* | 3.493 (3.378)† | |||
| β1** | −0.007 (−0.01)† | |||
| Medial antebrachialcutaneous | ||||
| 71 | 20 - 65 | 4 (4)§ | 2.7 (2.8) | 49 (48) |
| Lateral antebrachialcutaneous | ||||
| 71 | 20 - 65 | 8 (4)§ | 2.5 (2.5) | 51 (49) |
| Sural | ||||
| 134 | 20 | 9 (4) | 4.3 (4.5) | 41 (40) |
| 40 | 6 (2) | |||
| 60 | 4 (1) | |||
| β0* | 2.678 (2.223)† | |||
| β1* | −0.023 (−0.037)† | |||
| Superficial fibular | ||||
| 126¥ | 20 | 10 (5) | 3.9 (4.2) | 48 (44) |
| 40 | 7 (3) | |||
| 60 | 5 (1) | |||
| β0* | 2.629 (2.186)† | |||
| β1* | −0.018 (−0.029)† | |||
| Data are combined for NCS parameters with no age effect. | ||||
↵* Regressioncoefficients obtained from the quantile regression model: log (predicted value) = β0 + β1 (age).
↵† LLN - the lower limit of the 95% confidence interval at minimum values in the sample.
↵‡ ULN - represents the upper limit of the 95% confidence interval at maximum values in the sample.
↵§ Reference values for the median and the lateral antebrachialcutaneous nerves were calculated at the 5th percentile due to the small sample size.
↵¥ Eight out of 134 participants had unrecordable superficial fibular sensory amplitudes. Those were excluded from the analysis as recommended by the NDTF.
PL - Peak latency
D2 - index finger
D4 - ring finger
D5 - little finger