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| Challenge | Treatment | N | n | Adjusted means (Std Err) | 95% Confidence Interval |
| Cowhage | Placebo | 10 | 9 | 21.62 (2.838) | (15.32, 27.93) |
| SB705498 3% | 10 | 10 | 20.99 (2.805) | (14.72, 27.25) | |
| Histamine | Placebo | 10 | 10 | 23.67 (3.999) | (14.86, 32.48) |
| SB705498 3% | 10 | 10 | 19.02 (3.999) | (10.21, 27.83) |
