Table 3. Means (and standard errors) and results of Wilcoxon signed rank tests for the destination address entry tasks.
| Chevrolet | Volvo | W | p-value | |
|---|---|---|---|---|
| Self-reported workload | 3.59 (0.44) | 2.54 (0.28) | 924.5 | 0.154 |
| Task completion time | 66.68 (2.85) | 80.60 (1.71) | 408 | <0.001* |
| % change in heart rate | 1.66 (0.87) | 1.25 (0.67) | 801 | 0.996 |
| % change in skin conductance level | 11.59 (3.77) | 3.29 (2.44) | 811 | 0.172 |
| Mean off-road glance duration | 0.74 (0.02) | 0.82 (0.02) | 562 | 0.022* |
| % of off-road glances > 2.0 s | 1.02 (0.29) | 1.27 (0.36) | 777.5 | 0.813 |
| Total off-road glance time | 14.28 (1.22) | 22.56 (1.43) | 367 | <0.001* |
| Number of off-road glances | 18.65 (1.52) | 27.77 (1.75) | 397 | <0.001* |
| % change in speed (GPS) | 0.60 (0.62) | −0.98 (0.55) | 990 | 0.068 |
| % change in SD of speed | −29.53 (4.58) | −10.35 (5.46) | 550 | 0.016* |
| % change in major wheel reversals | 7.34 (6.10) | −8.32 (6.82) | 1003 | 0.051 |
Change scores represent the percentage (%) change from baseline just driving.
*
p < 0.05.
Time metrics in seconds.