Patient clinical characteristics by treatment time (N=3944)
| Treated within 4 hours of presentation (n=704) | Treatment delayed >4 hours (n=3240) | P value | |
| Type of head injury, n (%) | |||
| Open wound with underlying fracture (n=1432) | 249 (35.4) | 1183 (36.5) | 0.674 |
| Close (n=2483) | 445 (63.2) | 2038 (62.9) | |
| Number of serious injuries, n (%) | |||
| 0 (n=800) | 134 (19.0) | 666 (20.6) | 0.615 |
| 1 (n=3033) | 551 (78.3) | 2482 (76.6) | |
| ≥2 (n=108) | 18 (2.6) | 90 (2.8) | |
| GCS category, n (%) | |||
| Mild (n=2428) | 416 (59.1) | 2012 (62.1) | 0.099 |
| Moderate (n=871) | 154 (21.9) | 717 (22.1) | |
| Severe (n=645) | 134 (19.0) | 511 (15.8) | |
| KTS category, n (%) | |||
| Mild (n=3361) | 612 (87.1) | 2749 (84.9) | 0.318 |
| Moderate (n=393) | 60 (8.5) | 333 (10.3) | |
| Severe (n=187) | 31 (4.7) | 156 (4.8) | |
| Loss of consciousness, n (%) | |||
| No (n=1185) | 197 (28.0) | 988 (30.5) | 0.188 |
| Yes (n=2759) | 507 (72.0) | 2252 (69.5) | |
| Suspected alcohol use, n (%) | |||
| No (n=2685) | 484 (68.8) | 2201 (68.0) | 0.412 |
| Yes (n=1188) | 212 (30.1) | 976 (30.2) | |
| Unknown (n=68) | 8 (1.1) | 60 (1.9) | |
| Suspected drug use, n (%) | |||
| No (n=3512) | 627 (89.1) | 2885 (89.0) | 0.703 |
| Yes (n=338) | 63 (9.0) | 275 (8.5) | |
| Unknown (n=94) | 14 (2.0) | 80 (2.5) | |
| Pre-existing condition | |||
| No (n=3382) | 597 (84.9) | 2785 (86.0) | 0.054 |
| Yes (n=375) | 61 (8.7) | 315 (9.7) | |
| Unknown (n=186) | 45 (6.4) | 141 (4.4) |
GCS, Glasgow Coma Scale; KTS, Kampala Trauma Score.