Effects of Human-Centered Factors on Crash Injury Severities

Table 1

Summary statistics of the variables used for model building.

Variable name	Description	Mean (standard deviation)
Crash severity	Serious injury/minor injury	0.30/0.70
Driver error	Primary cause: error attributed to driver (1 = yes, 0 = no)	0.49 (0.50)
DUI	Primary cause: DUI (1 = yes, 0 = no)	0.09 (0.29)
Speed	Primary cause: speeding (1 = yes, 0 = no)	0.11 (0.32)
Distracted	Primary cause: distracted driving (1 = yes, 0 = no)	0.11 (0.31)
Fatigue	Driver condition at time of crash: fatigued (1 = yes, 0 = no)	0.06 (0.23)
Invalid license	License status of causal driver: invalid license (1 = yes, 0 = no)	0.07 (0.26)
No seatbelt	Seatbelt use: no seatbelt (1 = yes, 0 = no)	0.11 (0.31)
Female	Driver gender: female (1 = yes, 0 = no)	0.44 (0.50)
Black	Driver race: African American (1 = yes, 0 = no)	0.24 (0.43)
Young	Driver age: less than 30 (1 = yes, 0 = no)	0.42 (0.49)
Old	Driver age: more than 60 (1 = yes, 0 = no)	0.15 (0.36)
Unemployed	Driver employment status: unemployed (1 = yes, 0 = no)	0.30 (0.46)