Table 1.
Amplitude of P1 and N1 and respective latency times before and after surgery.
| Parameter | Before surgery (n=33) | After surgery (n=33) | P value |
|---|---|---|---|
| P1 amplitude (nV/deg2) | |||
| Ring 1 | 36.00 (77.20) | 59.20 (92.60) | <0.001 |
| Ring 2 | 45.70 (62.30) | 55.30 (97.30) | 0.040 |
|
| |||
| P1 latency (ms) | |||
| Ring 1 | 33.30 (30.40) | 34.30 (38.20) | 0.806 |
| Ring 2 | 33.30 (20.60) | 34.30 (30.40) | 0.955 |
|
| |||
| N1 amplitude (nV/deg2) | |||
| Ring 1 | 28.30 (127.30) | 46.30 (155.30) | <0.001 |
| Ring 2 | 20.80 (85.80) | 22.60 (47.40) | 0.550 |
|
| |||
| N1 latency (ms) | |||
| Ring 1 | 17.60 (48.80) | 18.60 (22.50) | 0.330 |
| Ring 2 | 17.60 (13.70) | 17.60 (27.40) | 0.977 |
Amplitude of P1 and N1 are expressed in nanovoltage (nV)/area degree2 (deg2) and implicit time (latency) in milliseconds (ms). All values are expressed as median (range). P values are obtained from the Wilcoxon signed-rank test.