Variable	Range
Passenger-level
Mean age of child passenger	5.4–8.2
Percentage of child passengers that were female	36–64
Percentage of children ejected from the vehicle	0–22
Percentage of children extricated from the vehicle	0–25
Percentage of children seated in the front seat	9–29
Percentage of children seated inappropriately in the front seat	5–19
Percentage of children unrestrained or inappropriately restrained	2–38
Driver-level
Mean driver age	29.6–39.7
Percentage of crashes with driver age <20y	0–28
Percentage of crashes with driver age 20–24y	0–19
Percentage of crashes with driver age >24y	66–97
Percentage of crashes with driver under the influence of alcohol	1–28
Vehicle-level
Mean vehicle years on the road	6.6–11.8
Percentage of all vehicles in a crash that were cars	19–63
Percentage of all vehicles in a crash that were vans/minivans	0–33
Percentage of all vehicles in a crash that were SUVs	11–49
Percentage of all vehicles in a crash that were pick-up trucks	6–36
Percentage of all vehicles in a crash that were larger than a pick-up truck	0–11
Percentage of all vehicles in a crash with disabling damage	41–100
Percentage of all vehicles in a crash with intrusion	0–6
Percentage of all vehicles in a crash with rollover mechanism	5–64
Crash-level
Mean speed limit at crash site	39–66
Percentage of crashes occurring in a 5–20 miles per hour speed limit zone	0–05
Percentage of crashes occurring in a 25–40 miles per hour speed limit zone	4–55
Percentage of crashes occurring in a 45–60 miles per hour speed limit zone	11–81
Percentage of crashes occurring in a 65–80 miles per hour speed limit zone	0–80
Percentage of crashes occurring in a zone with no speed limit	0–18
Percentage of crashes occurring on an interstate	0–47
Percentage of crashes occurring on a U.S. highway	0–51
Percentage of crashes occurring on a state highway	11–84
Percentage of crashes occurring on a county road	0–42
Percentage of crashes occurring on a local street	0–44
Percentage of crashes occurring on other roadway	0–32
Percentage of crashes occurring on a rural road	17–100
Percentage of crashes occurring during the day (6a–6p)	50–79
Percentage of crashes occurring over the weekend (Fri 5p–Mon 6a)	32–64
Percentage of crashes occurring in the winter (Dec–Feb)	6–68
Percentage of crashes occurring in the spring (Mar–May)	4–39
Percentage of crashes occurring in the summer (Jun–Aug)	11–66
Percentage of crashes occurring in the fall (Sep–Nov)	7–44
State policy-level
State open container law meeting federal requirements	0–1
State repeat offender law (for driving under the influence) meeting federal requirements	0–1
State administrative license suspension on first offense/refusal to submit to a chemical test for driving under the influence	0–1
State mandatory vehicle or license plate sanctions for driving under the influence	0–1
State maximum fine for first offense violating state child restraint laws	10–500
State maximum fine for first offense violating state seat belt laws	0–200
State maximum allowed speed limit	55–85
State law stating a preference for seating children in the rear seat	0–1
State has ≥1 level 1 pediatric trauma center	0–1
State number of level 1 pediatric trauma centers	0–5
State has ≥1 level 1 or level 2 pediatric trauma center	0–1
State number of level 2 pediatric trauma centers	0–4
State number of level 1 and level 2 pediatric trauma centers	0–8
State number of level 1 and level 2 pediatric trauma centers per 100,000 children	0–0.75
State trauma system in place (none, unfunded, funded)	0–2
State requires children to be in a rear-facing child safety seat when <1y or <20 pounds	0–1
State red light camera legislation present	0–1
State red light camera use prohibited	0–1
State red light camera use limited	0–1
State red light camera use permitted	0–1
State red light cameras in current use	0–1
State speed camera legislation present	0–1
State speed camera use prohibited	0–1
State speed camera use limited	0–1
State speed camera use permitted	0–1
State speed cameras in current use	0–1
State law allowing primary enforcement of seat belt laws for children	0–1