Factors Affecting Crash Involvement of Commercial Vehicle Drivers: Evaluation of Commercial Vehicle Drivers’ Characteristics in South Korea

Table 1

Descriptive statistics of variables for local bus.

Variable description		Number of samples	Minimum	Maximum	Mean	SD
Dependent variable
Recent crash involvement	0 = not involved in the crash for three years	63,256	—	—	—	—
	1 = involved in the crash for three years	12,179	—	—	—	—
Independent variables
Driver age	21–30	316	0	1	0	0.06
	31–40	4,250	0	1	0.06	0.23
	41–50	20,640	0	1	0.27	0.44
	51–60	36,744	0	1	0.49	0.5
	More than 61	13,485	0	1	0.18	0.38
Driving experience	Years of driving	75,435	0.04	59.33	16.26	9.72
Violation rate	Total number of violations per 10 years	75,435	0	7.5	0.08	0.22
Job change rate	Total number of job changes per year	75,435	0	48	0.27	0.8
Crash rate	Total number of crashes per 10 years	75,435	0	4.44	0.38	0.4