Table 1.
Descriptive statistics for 200mg and 300mg caffeine intake groups.
| 200 mg | 300 mg | |||
|---|---|---|---|---|
| Mean | Std. Deviation | Mean | Std. Deviation | |
| Age - Years | 35.2 | 6.7 | 33.6 | 4.8 |
| MOT - Baseline | 846.05 | 199.76 | 769.57 | 158.12 |
| MOT - Sleep deprivation | 881.28 | 235.08 | 756.11 | 129.87 |
| MOT - Caffeine intake | 754.33 | 171.63 | 670.47 | 103.62 |
| RTI - Baseline | 370.83 | 146.97 | 307.84 | 45.28 |
| RTI - Sleep deprivation | 375.49 | 123.30 | 327.23 | 55.31 |
| RTI - Caffeine intake | 342.54 | 50.25 | 312.79 | 33.87 |
| RVP (A-Prime) - Baseline | 0.910 | 0.041 | 0.92 | 0.044 |
| RVP (A-Prime) - Sleep deprivation | 0.920 | 0.045 | 0.94 | 0.044 |
| RVP (A-Prime) - Caffeine intake | 0.950 | 0.036 | 0.96 | 0.037 |
| RVP (Response latency) - Baseline | 470.61 | 121.75 | 505.32 | 121.36 |
| RVP (Response latency) - Sleep deprivation | 470.88 | 97.86 | 487.98 | 88.51 |
| RVP (Response latency) - Caffeine intake | 434.68 | 80.07 | 465.72 | 68.44 |
| SWM (Between errors) - Baseline | 12.78 | 12.59 | 19.66 | 16.17 |
| SWM (Between errors) - Sleep deprivation | 19.36 | 20.49 | 20.46 | 20.52 |
| SWM (Between errors) - Caffeine intake | 18.84 | 17.58 | 14.00 | 15.34 |
| SWM (Strategy) - Baseline | 29.63 | 5.12 | 32.26 | 6.25 |
| SWM (Strategy) - Sleep deprivation | 29.36 | 6.39 | 32.46 | 6.12 |
| SWM (Strategy) - Caffeine intake | 30.52 | 5.82 | 29.80 | 6.75 |
Abbreviations: MOT = Motor screening task; RTI = Reaction time; RVP = Rapid visual information processing; SWM = Spatial working memory; the exact p-values were indicated in the manuscript.