Variables

Classification

Mean

Standard Deviation (SD)

Age

Continuous variable

40.44

6.57

Gender

Female = 1 (0%),

Male = 2 (100%)

2

0

Education

Primary school = 1 (0%),

Secondary school = 2 (16.81%), High school = 3 (33.19%),

Diploma = 4 (37.5%), Associate = 5 (11.2%), Bachelor or higher = 6 (1.29%).

3.47

0.94

Marital status

Single = 1 (8.62%), Married = 2 (91.38%)

1.91

0.28

Migrant

Immigrant driver = 1 (53.01%), Indigenous driver = 2 (46.99%)

1.47

0.5

Smoking status

Smoker = 1 (33.62%), Non-smoker = 2 (66.38%)

1.66

0.47

Hours of sleep per day

1 - 4 hours = 1 (0%), 4 - 6 hours = 2 (23.71%), 6 - 8 hours = 3 (64.22%), 8 - 10 hours = 4 (12.07%)

2.88

0.59

Income

≤10 million Vietnamese Dong (VND) = 1 (56.46%), 10 - 20 = 2 (35.35%), 20 - 30 = 3 (4.74%), >30 = 4 (3.45%)

1.55

0.74

Daily driving hours

1 - 4 hours = 1 (12.5%), 8 - 10 hours = 2 (65.09%),

>10 hours = 3 (22.41%)

2.10

0.58

Years of driving

Continuous variable

7.66

4.49

Perceived income

Sufficient = 1 (46.12%), Insufficient = 2 (53.88%)

1.54

0.5

Annual training

Attending = 1 (87.5%), Not attending = 2 (12.5%)

1.12

0.33

Days of rest per month

1 - 3 days = 1 (69.83%), 4 - 7 days = 2 (29.31%),

8 - 14 days = 3 (0.86%)

1.31

0.48

Accident-experience in last 3 years

Occurrence = 1 (29.74%), No occurrence (70.26%)

1.70

0.46

Fines and penalties in last 3 years

No = 1 (60.34%), 1 = 2 (25%), 2 = 3 (9.05%), 3 = 4 (3.5%), >3 = 5 (2.16%)

1.63

1.00