Table 4. Comparison of differences in driving cluster characteristics.

Variables	Cluster 1(n = 51)		Cluster 2(n = 45)		F	P-value
	Mean	SD	Mean	SD
Gender	0.530	0.504	0.698	0.457	3.082	0.082
Age	0.227	0.262	0.504	0.294	22.911	0.000 **
Crash ratio	0.158	0.232	0.072	0.04	0.214	0.024 *
Maneuver judgment
Safe and legal event ratio	0.857	0.154	0.921	0.224	2.323	0.131
Safe but illegal event ratio	0.012	0.032	0.011	0.046	0.307	0.581
Unsafe but legal event ratio	0.074	0.107	0.012	0.045	9.455	0.003 **
Unsafe and illegal event ratio	0.057	0.113	0.056	0.212	0.009	0.994
Event nature
Single-vehicle event ratio	0.157	0.192	0.043	0.092	12.09	0.001 **
Straight-line event ratio	0.602	0.234	0.651	0.344	0.753	0.388
Direction change event ratio	0.241	0.225	0.306	0.329	1.046	0.309
Pre-incident maneuver
Steady driving event ratio	0.254	0.182	0.565	0.302	37.931	0.000 **
Direction change event ratio	0.259	0.176	0.078	0.133	31.927	0.000 **
Velocity change event ratio	0.487	0.229	0.357	0.304	6.121	0.015 *
Driver reaction
Braking reaction ratio	0.707	0.243	0.944	0.112	32.655	0.000 **
Steering reaction ratio	0.121	0.176	0.021	0.072	13.37	0.000 **
Accelerated reaction ratio	0.018	0.052	0.009	0.031	1.799	0.183
No reaction ratio	0.154	0.254	0.026	0.195	9.194	0.003 **
Distraction state
No-risk distraction event ratio	0.605	0.218	0.551	0.363	1.483	0.226
Low-risk distraction event ratio	0.240	0.215	0.385	0.342	4.624	0.034 *
Mid-risk distraction event ratio	0.124	0.193	0.042	0.091	7.204	0.009 **
High-risk distraction event ratio	0.031	0.054	0.022	0.083	0.489	0.486
Multiple distractions event ratio	0.204	0.172	0.092	0.184	9.478	0.003 **

Note

*: p<0.05

**: p<0.01