. Author manuscript; available in PMC: 2013 Mar 1.

Published in final edited form as: Accid Anal Prev. 2011 Oct 24;45(2):711–717. doi: 10.1016/j.aap.2011.09.040

Table 3.

Mean Individual Differences between the PASAT and baseline segments in at-fault safety errors, speed, and steering control, both within elderly and middle-aged drivers and between-groups. Between group tests were performed using the Wilcoxon-Rank Sum Test, while p-values of variable means were found using the One-sample T-Test.

Segment Performance Differences (PASAT – Baseline)
	Middle-Aged Drivers Mean (SD)	Elderly Drivers Mean (SD)	Between Groups p-values
At-fault Safety Errors	0.47 (1.16) ^b	0.54 (1.24) ^c	0.437
Mean MPH	−0.65 (1.91) ^a	−0.91 (3.27) ^a	0.617
SD MPH	0.47 (1.05) ^b	0.38 (1.36) ^a	0.672
Gas Pedal Hold	−0.004 (1.44)	0.965 (3.84) ^a	0.027
SD Lateral Acceleration	0.004 (0.003) ^c	0.003 (0.004) ^c	0.049
SD Steering (degrees)	0.98 (0.51) ^c	0.42 (1.29) ^b	<0.001
Steering Frequency	−0.087 (0.11) ^c	0.004 (0.12)	<0.001
# Steering Dev. ≥6°	9.12 (6.61) ^c	5.60 (9.04) ^c	0.005
# Steering Dev. ≥10°	0.43 (1.08) ^b	0.52 (3.11)	0.195

p <0.05,

p <0.01,

p <0.001.