Table 2.

Characteristics of the study population, by injury severity.

Characteristic (%)	Minor injury, no injury, or unknown	“Severe injury”
	n = 10,820,858	Incapacitating n = 160,617	Fatal n = 26,582
RUCC
1–3 (non-rural)	9,403,024 (86.9%)	127,680 (79.5%)	19,647 (73.9%)
4–5 (partly rural)	561,454 (5.2%)	10,713 (6.7%)	2058 (7.7%)
6–7 (rural)	726,010 (6.7%)	17,459 (10.9%)	3914 (14.7%)
8–9 (very rural)	110,201 (1.0%)	3458 (2.2%)	836 (3.2%)
Person
Age
0–14	670,204 (6.2%)	7817 (4.9%)	1010 (3.8%)
15–39	6,922,430 (64.0%)	95,474 (59.4%)	14,980 (56.4%)
40–64	2,594,745 (24.0%)	44,022 (27.4%)	6879 (25.9%)
65–79	484,018 (4.5%)	9762 (6.1%)	2324 (8.7%)
80+	149,461 (1.4%)	3542 (2.2%)	1389 (5.2%)
Male	5,520,360 (51.0%)	82,807 (51.6%)	17,472 (65.7%)
Driver	6,812,608 (63.0%)	104,296 (64.9%)	16,486 (62.0%)
Front passenger	1,541,440 (14.3%)	32,032 (19.9%)	5001 (18.8%)
Rear passenger	1,505,339 (13.9%)	19,822 (12.3%)	4121 (15.5%)
Unbelted	756,247 (7.0%)	36,153 (22.5%)	12,182 (45.8%)
Ejected from vehicle	20,705 (0.2%)	9385 (5.8%)	5722 (21.5%)
Vehicle/Crash
Alcohol involved	491,954 (4.6%)	20,454 (12.7%)	7385 (27.8%)
High speed	2,789,313 (25.8%)	52,294 (32.6%)	11,226 (42.2%)
Midnight to 6 AM	760,404 (7.0%)	23,348 (14.5%)	6247 (23.5%)
6 AM to noon	2,656,811 (24.6%)	37,089 (23.1%)	5328 (20.0%)
Noon to 6 PM	4,880,756 (45.1%)	58,580 (36.5%)	7658 (28.8%)
6 PM to midnight	2,488,069 (23.0%)	41,330 (25.7%)	7168 (27.0%)
>1 car collision	7,932,903 (73.3%)	92,011 (57.3%)	12,143 (45.7%)
Poor visibility	3,166,361 (29.3%)	48,077 (29.9%)	7535 (28.4%)
Slippery road	2,070,917 (19.1%)	28,616 (17.8%)	4265 (16.0%)
Interstate highway	1,102,761 (10.2%)	20,382 (12.7%)	3307 (12.4%)
Southern state	3,185,071 (29.4%)	82,634 (51.4%)	10,698 (40.2%)