. Author manuscript; available in PMC: 2011 Dec 7.

Published in final edited form as: Proc Int Driv Symp Hum Factors Driv Assess Train Veh Des. 2009;2009:76–82.

Table 2.

Results for car following measures (mean ± SD (median) and Wilcoxon Ranked sign test p values)

	Younger	Older	p-value
Coherence	0.80 ± 0.17 (0.84)	0.69 ± 0.20 (0.76)	0.019
Delay (seconds)	3.58 ± 2.39 (3.06)	3.13 ± 2.94 (2.22)	0.077
Gain	2.45 ± 3.24 (1.74)	2.66 ± 1.52 (2.24)	0.031
Mean following distance (m)	44.42 ± 43.23 (32.91)	82.45 ± 64.26 (59.95)	<0.0001
Standard deviation of following distance (m)	12.80 ± 24.57 (6.44)	20.15 ± 16.21 (15.66)	<0.0001