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Pre-, post- and difference scores on P2 in all conditions (n = 20, mean ± SEM)
| Control | Placebo | Caffeine | Active placebo | |
|---|---|---|---|---|
| Pre | 19.5 ± 2.0 | 20.0 ± 1.9 | 19.2 ± 2.2 | 19.3 ± 2.0 |
| Post | 19.5 ± 2.3 | 17.1 ± 1.7 | 17.2 ± 2.0 | 16.7 ± 1.8 |
| Difference | 0.0 ± 0.6 | −2.9 ± 1.0 | −2.0 ± 1.0 | −2.6 ± 1.1 |
