Table 3.
Division of studied population according to the classificatory 3-DEMO parameter "Shift".
| Classification | Limits | Scoliosis | Hyperkyphosis | Scoliosis & Hyperkyphosis | Normals |
| Right Shift | x < -8.0 | 9.8% | 4.3% | 50.0% | 5.0% |
| Left Shift | x > 4.1 | 49.2% | 8.7% | 25.0% | 0.0% |
| Frontally no Shift | -8.0 < x < 4.1 | 41.0% | 87.0% | 25.0% | 95.0% |
| Chi-Square test | P < 0.05 | ||||
| Anterior Shift | x < -26.4 | 0.0% | 0.0% | 0.0% | 0.0% |
| Posterior Shift | x > 4.6 | 44.3% | 100.0% | 75.0% | 5.0% |
| Sagittally no Shift | -26.4 < x < 4.6 | 55.7% | 0.0% | 25.0% | 95.0% |
| Chi-Square test | P < 0.05 | ||||
| Posterior Left Shift | 17.2% | 8,7% | 0.0% | 0.0% | |
| Posterior Right Shift | 6.6% | 4.3% | 50.0% | 5.0% | |
| Posterior Shift only | 20.5% | 87.0% | 25.0% | 0.0% | |
| Left Shift only | 32.0% | 0.0% | 25.0% | 0.0% | |
| Right Shift only | 3.3% | 0.0% | 0.0% | 0.0% | |
| No Shift | 20.5% | 0.0% | 0.0% | 95.0% | |
The Shift classificatory parameter is the displacement of the barycentre of the Top View with respect to the spinal normal axis; it was defined as Shift because it is as if the pathological spine had changed its position with respect to the pelvis, "shifting" away from the vertical C7-S1 axis.