Effects of In-Vehicle Navigation on Perceptual Responses and Driving Behaviours of Drivers at Tunnel Entrances: A Naturalistic Driving Study

Table 4

Statistical results of the R-R interval.

	Control		In-vehicle navigation			's d
	mean	sd	mean	sd
Zone 1	0.78	0.10	0.82	0.10	2.81	0.40
Zone 2	0.73	0.09	0.80	0.09	6.57	0.78
Zone 3	0.70	0.07	0.73	0.08	4.27	0.40
Zone 4	0.72	0.09	0.75	0.10	2.32	0.32

-test value. size Cohen's d.