SEP normal values
| Mean | SD | Range | Limit of normal values (mean+3 SD) | |
| Common peroneal nerve: | ||||
| Cauda equina latency (ms) | 10.4 | 0.7 | 9.6–12.8 | 12.5 |
| N14 latency (ms) | 13.9 | 0.96 | 12.4–16.4 | 16.8 |
| P27 latency (ms) | 26.1 | 2.3 | 22.1–30.1 | 33 |
| CE–P27 interpeak interval (ms)2-150 | 20 | 1.8 | 17.1–23.8 | 25.4 |
| Posterior tibial nerve: | ||||
| Cauda equina latency (ms) | 18.3 | 1.7 | 14.4–23 | 24.4 |
| N24 latency (ms) | 22.2 | 1.9 | 18.4–28 | 27.9 |
| P40 latency (ms) | 38 | 2.7 | 31.2–45.8 | 46.1 |
| CE–P40 interpeak interval (ms)2-151 | 19.7 | 1.6 | 16.4–23.4 | 24.5 |