Table 2.

Mean at-fault safety errors, speed, and steering control during baseline and the PASAT, with comparisons between middle-aged and elderly drivers via the Wilcoxon-Rank Sum Test.

	Middle-Aged Drivers Mean (SD)	Elderly Drivers Mean (SD)	p-values
At-fault Safety Errors
Baseline	0.30 (0.61)	0.65 (1.09)	0.082
PASAT 218	0.76 (1.05)	1.19 (1.17)	0.021
Mean MPH
Baseline	61.65 (7.52)	60.00 (5.34)	0.005
PASAT 218	61.00 (6.86)	59.09 (5.27)	0.005
SD MPH
Baseline	1.62 (1.16)	1.94 (0.91)	0.006
PASAT 218	2.09 (1.72)	2.33 (1.32)	0.012
Gas Pedal Hold
Baseline	2.19 (1.56)	3.12 (7.76)	0.882
PASAT 218	2.19 (1.32)	4.09 (8.31)	0.164
SD Lateral Acceleration
Baseline	0.04 (0.004)	0.04 (0.006)	0.586
PASAT 218	0.04 (0.005)	0.04 (0.006)	0.550
SD Steering (degrees)
Baseline	1.95 (0.47)	2.21 (2.98)	0.583
PASAT 218	2.93 (0.50)	2.64 (1.85)	<0.001
Steering Frequency
Baseline	0.48 (0.11)	0.53 (0.13)	0.029
PASAT 218	0.39 (0.09)	0.53 (0.16)	<0.001
# Steering Dev. ≥6°
Baseline	3.86 (4.97)	3.24 (4.81)	0.552
PASAT 218	12.98 (7.89)	8.84 (8.58)	0.001
# Steering Dev. ≥10°
Baseline	0.00 (0.00)	0.13 (0.61)	0.124
PASAT 218	0.43 (1.08)	0.65 (3.38)	0.322
Demographics
Education	15.63 (2.31)	15.70 (2.72)	0.6658
Miles/Week	162.86 (157.64)	151.33 (191.01)	0.3471
Gender	23 Males	46 Males	0.3833