Characteristics of the 501 patients, submitted to early CT scan according to protocol, and not considered by NICE recommendations
| CT negative (n = 461) | CT positive (n = 40) | Odds ratio (95% CI) | p value* | |
|---|---|---|---|---|
| CI, confidence interval; *Mann-Whitney U test or Fisher’s exact test: p<0.05; †international normalised ratio in patients with coagulopathy. | ||||
| Median (IQR) age, years | 53 (29 to 77) | 68 (46 to 78) | – | 0.054 |
| Median (IQR) INR† | 2.3 (2.0 to 2.8) | 2.2 (2.2 to 2.6) | – | 0.464 |
| Cause of injury | ||||
| Fall | 204 (44.3%) | 19 (47.5%) | 1.14 (0.59 to 2.18) | 0.741 |
| Crash | 179 (38.8%) | 15 (37.5%) | 0.94 (0.48 to 1.84) | 1.000 |
| Assault | 15 (3.3%) | 2 (5.0%) | 1.56 (0.34 to 7.10) | 0.637 |
| Occupational | 32 (6.9%) | 2 (5.0%) | 0.71 (0.16 to 3.06) | 1.000 |
| Risk factors | ||||
| Coagulopathy | 50 (10.8%) | 16 (40.0%) | 5.48 (2.73 to 11.00) | <0.001 |
| Dangerous mechanism | 156 (33.8%) | 16 (40.0%) | 1.30 (0.67 to 2.53) | 0.488 |
| Age ⩾65 years | 191 (41.4%) | 22 (55.0%) | 1.73 (0.90 to 3.31) | 0.133 |
| History of epilepsy | 20 (4.3%) | 2 (5.0%) | 1.16 (0.26 to 5.15) | 0.692 |
| Previous neurosurgery | 26 (5.6%) | 1 (2.5%) | 0.43 (0.06 to 3.25) | 0.713 |
| Alcohol and/or drugs | 51 (11.1%) | 7 (17.5%) | 1.71 (0.72 to 4.05) | 0.205 |