Demographics and clinical characteristics by site
| Characteristics Median (25th–75th) or n (%) | Overall N=1008 | S N=292 | W N=253 | NE N=182 | MA N=281 | P value |
| Age (years) | 14 (10–16) | 11 (6–14) | 13 (8–14) | 17 (16–18) | 16 (14–17) | <0.001 |
| Age groups | ||||||
| 0–4 | 126 (13) | 65 (22) | 38 (15) | 4 (2) | 19 (7) | <0.001 |
| 5–9 | 116 (11) | 64 (22) | 32 (13) | 2 (1) | 18 (6) | |
| 10–13 | 208 (21) | 82 (28) | 81 (32) | 6 (3) | 39 (14) | |
| 14–18 | 558 (55) | 81 (28) | 102 (40) | 170 (94) | 205 (73) | |
| Medicaid | 672 (67) | 216 (74) | 156 (62) | 110 (60) | 190 (68) | 0.004 |
| Male | 778 (77) | 207 (71) | 185 (73) | 155 (85) | 231 (82) | <0.001 |
| Race/ethnicity | <0.001 | |||||
| Black | 684 (68) | 211 (73) | 155 (62) | 68 (37) | 250 (89) | |
| White | 120 (12) | 47 (16) | 12 (5) | 45 (25) | 16 (6) | |
| Asian | 13 (1) | 1 (0) | 2 (1) | 9 (5) | 1 (0) | |
| Hispanic | 118 (12) | 22 (8) | 41 (16) | 44 (24) | 11 (4) | |
| Multiracial | 24 (3) | 8 (3) | 1 (0) | 14 (8) | 1 (0) | |
| Unknown | 42 (4) | 0 (0) | 38 (15) | 2 (1) | 2 (1) | |
| Injury Severity Score | 0.254 | |||||
| 0–12 | 701 (73) | 172 (69) | 194 (77) | 127 (70) | 208 (75%) | |
| 13–25 | 169 (18) | 57 (23) | 36 (14) | 32 (18 | 44 (16) | |
| 26–50 | 83 (9) | 21 (8) | 21 (8) | 18 (10) | 23 (8) | |
| 51–75 | 11 (1) | 1 (0) | 2 (1) | 4 (2) | 4 (1) |
Bold indicates statistical significance.
MA, Mid-Atlantic; NE, Northeast; S, South or Southern; W, West.