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Comparison of pre-drug values.
| Tramadol session | Placebo session | |
|---|---|---|
| Perceptive threshold (mJ/mm2) | 69.8 ± 4.5 | 67.8 ± 4.8 |
| N1 latency (ms) | 185 ± 5.3 | 181 ± 4.5 |
| N1 amplitude (μV) | 6.4 ± 0.8 | 5.8 ± 0.5 |
| N2 latency (ms) | 207 ± 4.3 | 204 ± 3.3 |
| N2 amplitude (μV) | 11.8 ± 1,1 | 10.5 ± 0.7 |
| P2 latency (ms) | 278 ± 7.9 | 283 ± 8.0 |
| P2 amplitude (μV) | 12.6 ± 0.9 | 13.1 ± 1.1 |
No pre-drug value was significantly different between the tramadol and placebo sessions.
