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Subject characteristics
| Age (mean (range), years) | 25.2 (18–32) |
| Weight (mean (range), kg) | 61.7 (47.6–90.3) |
| Dose AMPH (mean (range), mg/kg) | 0.32 (0.22–0.42) |
| Daily caffeine intake (mean (range), mg) | 126.1 (0.0–768.0) |
| Personality scale scores (mean (range)) | |
| TPQ | |
| Novelty seeking | 15 (8–23) |
| Harm avoidance | 9 (0–18) |
| Reward dependence | 20 (9–27) |
| SSS | |
| Total score | 18 (7–30) |
| EPQ | |
| Total score | 20 (15–26) |
