Analysis with patients who had drunk alcohol before their head injury excluded
| Variables tested | Number of scans obtained/226 | p value |
|---|---|---|
| Actual compared with British guidelines | 57 v 62 | 0.59 |
| Canadian CT head rule compared with British guidelines | 84 v 62 | <0.01 |
| Canadian CT head rule compared with actual | 84 v 57 | <0.01 |