Table 6
Equating the effects of sleep deprivation and alcohol consumption
| Test and measure | Hours (decimal) of wakefulness equivalent to BAC concentrations | ||||||
|---|---|---|---|---|---|---|---|
| BAC 0.05% | BAC 0.1% | ||||||
| Mean | 95% CI | %6-150 | Mean | 95% CI | %6-150 | ||
| Reaction time task: | |||||||
| Speed (ms) | 18.04 | 17.12 to 18.96 | 76 | 18.71 | 17.56 to 19.86 | 64 | |
| Accuracy (misses) | 17.31 | 16.51 to 18.11 | 42 | 17.74 | 16.51 to 18.97 | 45 | |
| Dual task: | |||||||
| Speed (ms) | 17.73 | 16.75 to 18.71 | 84 | 19.65 | 18.58 to 20.77 | 67 | |
| Hand-eye coordination (level of difficulty) | 18.43 | 17.41 to 19.45 | 79 | 19.42 | 18.40 to 20.44 | 58 | |
| Tracking task: | |||||||
| Hand-eye coordination (level of difficulty) | 18.25 | 17.37 to 19.13 | 74 | 19.01 | 18.91 to 19.97 | 61 | |
| Mackworth clock vigilance: | |||||||
| Speed (ms) | 17.08 | 16.20 to 17.96 | 82 | 18.10 | 16.85 to 19.35 | 58 | |
| Accuracy (misses) | 17.64 | 16.72 to 18.56 | 68 | 18.80 | 17.93 to 19.67 | 76 | |
| Symbol digit task: | |||||||
| Speed (ms) | 18.55 | 17.43 to 19.67 | 50 | 18.91 | 17.92 to 19.90 | 48 | |
| Speed (symbols inspected (n)) | 18.52 | 17.46 to 19.58 | 57 | 18.64 | 17.65 to 19.63 | 79 | |
| Accuracy (correct (%)) | 16.91 | 15.72 to 18.10 | 41 | 18.39 | 17.01 to 19.77 | 42 | |
| Spatial memory task: | |||||||
| Accuracy (length of recalled sequence) | 18.05 | 17.09 to 19.01 | 86 | 17.88 | 16.92 to 18.84 | 64 | |
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↵6-150 Numerator=number of subjects contributing data; denominator=number of subjects whose range of BAC incorporated 0.05% (n=37 or 38) or 0.1% (n=33).
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Amount of sleep deprivation required to produce performance decrements equivalent to varying concentrations of blood alcohol (BAC), and the time of day at which the equivalence occurred in this study.
