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

Table 4

Descriptive statistics of variables for truck.

Variable description		Number of samples	Minimum	Maximum	Mean	SD
Dependent variable
Recent crash involvement	0 = not involved in the crash for three years	268,245	—	—	—	—
	1 = involved in the crash for three years	17,231	—	—	—	—
Independent variables
Driver age	21–30	2,704	0	1	0.01	0.09
	31–40	31,887	0	1	0.11	0.31
	41–50	85,021	0	1	0.3	0.45
	51–60	102,815	0	1	0.36	0.48
	More than 61	63,049	0	1	0.22	0.41
Driving experience	Years of driving	285,476	0.04	58.25	12.66	9.51
Violation rate	Total number of violations per 10 years	285,476	0	11.43	0.12	0.29
Job change rate	Total number of job changes per year	285,476	0	48	0.13	0.62
Crash rate	Total number of crashes per 10 years	285,476	0	3.65	0.22	0.29