Mean, SD, minimum, and maximum values for each of the variables collected.
| Variable | Mean | SD | Minimum | Maximum |
| Age | 111.0 | 51.0 | 11 | 196 |
| BDI | 7.1 | 1.7 | 3.6 | 12.2 |
| ADI | 2.8 | 0.8 | 0.8 | 4.8 |
| PADI | 18.7 | 2.1 | 14.1 | 23.2 |
| B-C1 | 29.2 | 2.8 | 21.4 | 35.3 |
| Op-C1 | 40.7 | 4.2 | 30.4 | 48.8 |
| Powers ratio | 0.72 | 0.10 | 0.59 | 1.01 |
| CCI-r | 2.8 | 0.8 | 1.1 | 5 |
| CCI-l | 2.8 | 0.7 | 0.9 | 5 |
| LMI-r | 3.2 | 0.6 | 1.9 | 4.8 |
| LMI-l | 3.3 | 0.5 | 1.7 | 4.6 |
ADI, atlanto-dens interval; B-C1, basion-to-C1 distance; BDI, basion-dens interval; CCI, condylar-to-cervical spine interval; l, left; LMI, lateral mass interval; Op-C1, opisthion-to-C1 distance; PADI, posterior atlanto-dens interval; r, right.