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Table 2 Objective and subjective measures of driving performance

From: The impact of sleep deprivation and alcohol on driving: a comparative study

Outcome measure

Rested

Sleep deprived

Intoxicated

P value impact of coffee when sleep deprived

P value sleep deprived vs rested

P value intoxicated vs rested

Before coffee

After coffee

Before coffee

After coffee

Before coffee

After coffee

Mean LCT MDLT (SD)

0.33 (0.06)

0.40 (0.09)

0.62 (0.33)

0.71 (0.47)

0.54 (0.17)

0.55 (0.13)

0.03

< 0.0001

< 0.0001

Mean braking reaction time (SD)

1667 (276.5)

1620 (294.5)

2131 (665.9)

2149 (790.2)

1755 (325.5)

1779 (368.5)

0.58

< 0.0001

0.03

Mean lane changing reaction time (SD)

2785 (457.6)

2737 (495.5)

3580 (1371)

3636 (1386)

2928 (566.3)

2917 (557.2)

0.35

< 0.0001

0.0058

Mean KSS (SD)

3.53 (1.55)

2.7 (1.26)

7.87 (0.94)

6.8 (1.35)

4.47 (1.61)

3.9 (1.56)

< 0.0001

< 0.0001

0.02

Mean Ability (SD)

4.7 (0.59)

4.87 (0.35)

2.53 (0.90)

3.4 (0.97)

2.83 (0.83)

3.37 (0.76)

< 0.0001

< 0.0001

< 0.0001