Table 1.

Polynomial coefficients (C₁, C₂, C₃ and C₄) for prediction equations of 20 parameters per vertebral level of the human thoracic and lumbar spine.

Vertebral parameter		Abbreviation	C1	C2	C3	C4	SD	R2	P-value
Endplate	Width	EPWS	121.650	−15.403	0.742	−0.010	1.195	0.982	1.07E−10
		EPWI	300.140	−43.509	2.206	−0.035	1.454	0.976	5.19E−10
	Depth	EPDS	−60.076	8.983	−0.293	0.004	0.852	0.981	1.31E−10
		EPDI	−63.590	9.473	−0.300	0.003	0.769	0.981	1.26E−10
	Inclination	EPIS	−66.833	12.035	−0.691	0.013	0.699	0.606	0.008981
		EPII	66.233	−9.095	0.418	−0.006	0.606	0.514	0.030367
Vertebral body	Width	VBW*	4.1409	0.748	–	–	1.287	0.969	5.69E−05
	Depth	VBD**	−80.223	10.313	−0.350	0.004	0.523	0.995	0.000666
Pedicle	Width	PWL	230.261	−34.915	1.777	−0.029	1.682	0.590	0.011194
		PWR	157.740	−23.284	1.168	−0.019	1.446	0.537	0.022469
	Height	PHL	168.200	−27.194	1.522	−0.027	0.954	0.853	2.80E−05
		PHR	105.820	−17.256	0.999	−0.018	0.872	0.879	8.65E−06
	Transverse inclination	PTIL	−10.658	2.9889	−0.099	−0.001	2.741	0.693	0.002089
		PTIR	−202.510	31.347	−1.496	0.023	2.877	0.524	0.026147
	Sagittal inclination	PSIL	305.290	−39.194	1.734	−0.025	4.064	0.524	0.026141
		PSIR	−275.130	53.937	−3.119	0.057	3.403	0.669	0.003290
Spinal canal	Width	SCW	206.750	−26.838	1.218	−0.017	0.634	0.964	6.76E−09
	Depth	SCD	−2.449	3.8232	−0.254	0.006	0.573	0.811	0.000123
Spinous process	Length	SPL	−947.110	168.10	−9.310	0.170	3.472	0.882	7.43E−06
Transverse process	Width	TPW	−343.670	80.885	−5.090	0.102	7.259	0.616	0.007667

SD in mm (for linear dimensions) or in degree (for angular dimensions).

The basic form of the prediction equations is y = C₁ + C₂x+C₃x² + C₄x³ where y is the value of the parameter to be predicted and x is the value of the VBHP on each vertebral level.

S, superior; I, inferior; L, left; R, right.

^*For VBW, x is the value of EPWS/EPWI on each vertebral level.

^**For VBD, x is the value of EPDs/EPDI on each vertebral level.