Results from 1-way analysis of variance (Welch’s test).
| Age, mo | |||||||||
| ≤24 | 25–48 | 49–72 | 73–96 | 97–120 | 121–144 | 145–168 | >168 | P Value | |
| n | 8 | 7 | 12 | 11 | 13 | 16 | 18 | 15 | |
| BDI | 7.6 (1.0) | 7.7 (1.9) | 8.5 (2.0) | 7.9 (1.2) | 7.5 (1.3) | 6.9 (1.4) | 6.0 (1.3) | 6.3 (1.8) | 0.003 |
| ADI | 2.3 (0.9) | 2.9 (0.8) | 3.2 (0.7) | 3.4 (0.9) | 2.9 (0.7) | 2.8 (0.7) | 2.7 (0.6) | 2.2 (0.5) | 0.002 |
| PADI | 17.1 (2.5) | 18.7 (2.3) | 17.9 (1.8) | 17.6 (1.7) | 19.1 (1.6) | 18.4 (2.1) | 19.1 (2.0) | 19.8 (2.2) | 0.129 |
| B-C1 | 24.2 (2.0) | 27.6 (3.5) | 29.1 (2.4) | 27.7 (2.0) | 30.1 (1.4) | 30.3 (2.2) | 30.1 (2.3) | 30.9 (2.2) | <0.001 |
| Op-C1 | 36.0 (3.8) | 40.4 (4.7) | 38.0 (3.6) | 39.5 (3.6) | 40.2 (3.6) | 41.6 (3.3) | 43.4 (3.6) | 42.8 (3.3) | <0.001 |
| Powers ratio | 0.67 (0.04) | 0.69 (0.06) | 0.77 (0.08) | 0.71 (0.06) | 0.76 (0.09) | 0.73 (0.05) | 0.70 (0.06) | 0.72 (0.04) | 0.017 |
| CCI-r | 3.0 (1.0) | 3.5 (1.1) | 3.2 (0.5) | 3.0 (0.5) | 2.9 (0.8) | 2.9 (0.7) | 2.7 (0.8) | 2.2 (0.7) | 0.020 |
| CCI-l | 3.1 (0.9) | 3.2 (0.4) | 3.3 (0.5) | 2.9 (0.5) | 3.0 (0.8) | 2.9 (0.6) | 2.6 (0.7) | 2.1 (0.7) | 0.004 |
| LMI-r | 3.0 (0.5) | 3.4 (0.2) | 3.4 (0.5) | 3.5 (0.8) | 3.3 (0.6) | 3.3 (0.7) | 3.0 (0.6) | 3.0 (0.5) | 0.150 |
| LMI-l | 2.9 (0.4) | 3.5 (0.4) | 3.4 (0.4) | 3.4 (0.3) | 3.4 (0.7) | 3.4 (0.5) | 3.1 (0.6) | 3.1 (0.4) | 0.031 |
Mean (SD) values are presented for each age cohort. All measurements are in mm except for the Powers ratio. Statistically significant results are in boldface.
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.