Patient and injury characteristics in the JTDB and NTDB
| Characteristics | Unmatched patients | Matched patients | ||||
| JTDB(n= 22 535) | NTDB(n=112 060) | P values | JTDB(n=14 960) | NTDB(n=14 960) | P values | |
| Age (years) | ||||||
| <20 | 828 (3.7) | 5927 (5.3) | <0.001 | 507 (3.4) | 507 (3.4) | 1.000 |
| 20–39 | 3241 (14.4) | 31 643 (28.2) | 2198 (14.7) | 2198 (14.7) | ||
| 40–59 | 4318 (19.2) | 32 703 (29.2) | 2944 (19.7) | 2944 (19.7) | ||
| 60–79 | 7890 (35.0) | 27 269 (24.3) | 5211 (34.8) | 5211 (34.8) | ||
| ≥80 | 6258 (27.8) | 14 518 (13.0) | 4100 (27.4) | 4100 (27.4) | ||
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Sex (male) | 13 126 (58.2) | 72 786 (65.0) | <0.001 | 8875 (59.3) | 8875 (59.3) | 1.000 |
| Missing | 7 (0.0) | 24 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Injury type | ||||||
| Blunt | 21 310 (94.6) | 104 233 (93.1) | <0.001 | 14 673 (98.1) | 14 673 (98.1) | 1.000 |
| Penetrating | 530 (2.4) | 3483 (3.1) | 137 (0.9) | 137 (0.9) | ||
| Burn | 379 (1.7) | 766 (0.7) | 146 (1.0) | 146 (1.0) | ||
| Other | 160 (0.7) | 3497 (3.1) | 4 (0.0) | 4 (0.0) | ||
| Missing | 156 (0.7) | 81 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Mechanism | ||||||
| MVC | 5986 (26.6) | 39 591 (35.4) | <0.001 | 4347 (29.1) | 4347 (29.1) | 1.000 |
| Fall | 12 269 (54.4) | 45 417 (40.6) | 8780 (58.7) | 8780 (58.7) | ||
| Pedestrian | 1449 (6.4) | 5731 (5.1) | 601 (4.0) | 601 (4.0) | ||
| SW | 400 (1.8) | 3479 (3.1) | 137 (0.9) | 137 (0.9) | ||
| Others | 1971 (8.7) | 17 761 (15.9) | 1095 (7.3) | 1095 (7.3) | ||
| Missing | 460 (2.0) | 81 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Cause of trauma | ||||||
| Unintentional | 20 793 (92.3) | 101 741 (90.9) | <0.001 | 14 712 (98.3) | 14 712 (98.3) | 1.000 |
| Self-inflicted | 909 (4.0) | 1221 (1.1) | 116 (0.8) | 116 (0.8) | ||
| Assault | 229 (1.0) | 8505 (7.6) | 122 (0.8) | 122 (0.8) | ||
| Others | 440 (2.0) | 512 (0.5) | 10 (0.1) | 10 (0.1) | ||
| Missing | 164 (0.7) | 81 (0.1) | 0 (0.0) | 0 (0.0) | ||
| SBP (mm Hg) | ||||||
| <90 | 1423 (6.3) | 3628 (3.3) | <0.001 | 260 (1.7) | 260 (1.7) | 1.000 |
| 90–109 | 2303 (10.2) | 9874 (9.1) | 1171 (7.8) | 1171 (7.8) | ||
| ≥110 | 18 335 (81.4) | 95 443 (87.6) | 13 529 (90.4) | 13 529 (90.4) | ||
| Missing | 474 (2.1) | 3115 (2.8) | 0 (0.0) | 0 (0.0) | ||
| GCS score | ||||||
| 3–5 | 1252 (5.6) | 9174 (8.6) | <0.001 | 488 (3.3) | 488 (3.3) | 1.000 |
| 6–8 | 970 (4.3) | 2435 (2.3) | 334 (2.2) | 334 (2.2) | ||
| 9–11 | 915 (4.1) | 2380 (2.2) | 332 (2.2) | 332 (2.2) | ||
| 12–15 | 17 166 (76.2) | 93 047 (86.9) | 13 806 (92.3) | 13 806 (92.3) | ||
| Missing | 2232 (9.9) | 5024 (4.5) | 0 (0.0) | 0 (0.0) | ||
| Anatomic severity | ||||||
| ISS | ||||||
| 9–14 | 12 363 (54.9) | 68 239 (60.9) | <0.001 | 9363 (62.6) | 9363 (62.6) | 1.000 |
| 15–24 | 5849 (26.0) | 26 968 (24.1) | 3912 (26.1) | 3912 (26.1) | ||
| 25–39 | 3605 (16.0) | 14 496 (12.9) | 1585 (10.6) | 1585 (10.6) | ||
| 40–75 | 718 (3.2) | 2357 (2.1) | 100 (0.7) | 100 (0.7) | ||
| Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | ||
| Injury distribution | ||||||
| Head AIS score ≥3 | 7566 (33.6) | 39 517 (35.3) | <0.001 | 4768 (31.9) | 4768 (31.9) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Face AIS score ≥3 | 216 (1.0) | 1475 (1.3) | <0.001 | 62 (0.4) | 62 (0.4) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Neck AIS score ≥3 | 88 (0.4) | 1016 (0.9) | <0.001 | 14 (0.1) | 14 (0.1) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Chest AIS score ≥3 | 5352 (23.7) | 34 450 (30.8) | <0.001 | 3108 (20.8) | 3108 (20.8) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Abdomen AIS score ≥3 | 1301 (5.8) | 8838 (7.9) | <0.001 | 582 (3.9) | 582 (3.9) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0.0) | 0 (0.0) | ||
| Spine AIS score ≥3 | 2575 (11.4) | 11 281 (10.1) | <0.001 | 1416 (9.5) | 1416 (9.5) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0) | 0 (0) | ||
| Upper extremity score ≥3 | 1359 (6.0) | 5792 (5.2) | <0.001 | 728 (4.9) | 728 (4.9) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | (0) | (0) | ||
| Lower extremity score ≥3 | 8389 (37.2) | 29 364 (26.2) | <0.001 | 5574 (37.3) | 5574 (37.3) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | (0) | (0) | ||
| Skin AIS score ≥3 | 320 (1.4) | 836 (0.7) | <0.001 | 137 (0.9) | 137 (0.9) | 1.000 |
| Missing | 0 (0.0) | 59 (0.1) | 0 (0) | 0 (0) | ||
Data are presented as number (%).
AIS, Abbreviated Injury Scale; GCS, Glasgow Coma Scale; ISS, Injury Severity Score; JTDB, Japanese Trauma Data Bank; MVC, motor vehicle crash; NTDB, National Trauma Data Bank; SBP, systolic blood pressure; SW, stab wound.