Table 2.

The influence of electrocardiogram (ECG) indicators on driving risk. LF/HF—ratio of absolute power of the low-frequency band to that of the high-frequency band; SDNN—standard deviation of normal to normal R–R intervals of the heart rate; CV—coefficient of variation of the R–R intervals.

Lane-Changing Stage	Influence Factors	LOS		Driving Duration
		I 1	I 2	I 1	I 2
Car following	LF/HF	2.015	0.032	1.264	0.248
	SDNN	3.842	0.024	3.475	0.033
	CV	9.459	0.006	6.894	0.013
Perception	LF/HF	6.235	0.007	1.153	0.357
	SDNN	3.780	0.025	12.580	0.002
	CV	25.857	<0.001	8.237	0.003
Intention	LF/HF	7.822	0.007	3.265	0.135
	SDNN	4.330	0.016	15.710	0.002
	CV	49.166	<0.001	14.762	0.001
Execution	LF/HF	16.506	<0.001	13.208	0.033
	SDNN	4.370	0.015	9.515	0.001
	CV	74.259	<0.001	24.513	<0.001