Table 3. Differences in intraoperative EP changes between patients with vascular disease and tumor
| Variables | Disease category | EP changes (%) |
| Mean (SD) | Min | 25% | Median | 75% | Max |
| ΔSEPLat | Total (N = 104) | 5.4 | (3.5) | −1.6 | 3.1 | 4.9 | 7.2 | 22.4 |
| Vascular (N = 63) | 5.2 | (3.5) | 0.5 | 2.7 | 4.7 | 6.8 | 22.4 |
| Tumor (N = 41) | 5.7 | (3.5) | −1.6 | 3.4 | 5.9 | 7.9 | 17.4 |
| ΔMEPAmp | Total (N = 104) | 21.2 | (22.2) | 0.0 | 6.7 | 21.2 | 33.2 | 99.8 |
| Vascular (N = 63) | 19.9 | (17.4) | 0.0 | 2.7 | 20.2 | 30.0 | 99.8 |
| Tumor (N = 41) | 28.7 | (27.4) | 0.0 | 8.5 | 25.4 | 36.5 | 99.7 |
EP: evoked potential; SD: standard deviation; Min: minimum; %: percentile; Max: maximum; ΔSEPLat: latency change of somatosensory evoked potential; ΔMEPAmp: amplitude change of motor evoked potential.