Table 6

Equating the effects of sleep deprivation and alcohol consumption

Test and measureHours (decimal) of wakefulness equivalent to BAC concentrations
BAC 0.05%BAC 0.1%
Mean95% CI%6-150Mean95% CI%6-150
Reaction time task:
 Speed (ms)18.0417.12 to 18.967618.7117.56 to 19.8664
 Accuracy (misses)17.3116.51 to 18.114217.7416.51 to 18.9745
Dual task:
 Speed (ms)17.7316.75 to 18.718419.6518.58 to 20.7767
 Hand-eye coordination (level of difficulty)18.4317.41 to 19.457919.4218.40 to 20.4458
Tracking task:
 Hand-eye coordination (level of difficulty)18.2517.37 to 19.137419.0118.91 to 19.9761
Mackworth clock vigilance:
 Speed (ms)17.0816.20 to 17.968218.1016.85 to 19.3558
 Accuracy (misses)17.6416.72 to 18.566818.8017.93 to 19.6776
Symbol digit task:
 Speed (ms)18.5517.43 to 19.675018.9117.92 to 19.9048
 Speed (symbols inspected (n))18.5217.46 to 19.585718.6417.65 to 19.6379
 Accuracy (correct (%))16.9115.72 to 18.104118.3917.01 to 19.7742
Spatial memory task:
 Accuracy (length of recalled sequence)18.0517.09 to 19.018617.8816.92 to 18.8464
  • 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).

  • 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.