Table 4.

Division of studied population according to the classificatory 3-DEMO parameter "Phase".

Classification	Limits	Scoliosis	Hyperkyphosis	Scoliosis & Hyperkyphosis	Normals
Anisophasic	Phase > 8.1	58.2%	0.0%	50.0%	3.6%
Isophasic	Phase < 8.1	41.8%	100.0%	50.0%	96.4%
Chi-square test		P < 0.05

The classificatory parameter defined Phase is obtained dividing the spinal area for the diagonal of the minimum rectangle in which the Top View is inscribable; in practice, Phase is the Top View graphical representation of the 3D spatial evolution of the curve.