SP and MEP parameters (mean (SD)) according to severity of head injury2-151
| Parameters | Control group (n=20) | Minor head injury (n=10) | Mild head injury (n=22) | Moderate head injury (n=6) |
| MEP threshold (motor resting threshold) | 40.2 (6.1) | 42.3 (4.3) | 55.9 (11.6)2-150 | 60.7 (11.9)2-150 |
| SP threshold (inhibition threshold) | 34.2 (5.2) | 36.1 (3.8) | 43.2 (6.5)2-150 | 49.5 (13.4)2-150 |
| Interthreshold difference | 6.0 (2.7) | 6.2 (2.1) | 12.7(6.4)2-150 | 11.2 (4.0) |
| MEP/M wave amplitude ratio (%) | 29.9 (9.1) | 32.1 (13.5) | 12.1 (9.3)2-150 | 15.3 (12.7)2-150 |
| Central motor conduction time (ms) | 7.4 (0.8) | 8.1 (1.4) | 8.9 (1.1)2-150 | 8.7 (2.0) |
| Between side MEP threshold difference | 1.6 (1.3) | 2.3 (1.6) | 10.4 (7.8)2-150 | 5.5 (3.8) |
| Between side SP threshold difference | 2.6 (1.8) | 1.5 (1.3) | 3.2 (2.9) | 3.0 (2.8) |
| SP duration (ms) at intensity of 130% MEP threshold | 150.8 (37.0) | 151.9 (25.7) | 196.1 (35.8)2-150 | 194.7 (35.4)2-150 |