Table 2.

Digital X-ray and CT data of the C4–6

Cervical vertebrae	IBH (mm)	aIBH	23.24 ± 2.14
		pIBH	20.71 ± 1.73
	IBA (°)	nIBA	10.18 ± 2.44
		eIBA	17.85 ± 3.51
		fIBA	2.50 ± 3.39
		rIBA	15.35 ± 4.77
Endplate	Lower C4 (mm)	APD	16.63 ± 2.13
		TD	16.97 ± 1.82
		SRoC	21.56 ± 8.07
		CRoC	129.63 ± 53.85
	Upper C6 (mm)	APD	16.50 ± 2.21
		TD	16.90 ± 2.49
		SRoC	115.25 ± 69.29
		CRoC	95.18 ± 59.10

Data are expressed as mean ± SD

aIBH, anterior intervertebral body height; pIBH, posterior intervertebral body height; nIBA, neutral lateral intervertebral body angle; eIBA, extension IBA; fIBA, flexion IBA; APD, anteroposterior diameter; TD, transverse diameter; SRoC, sagittal radius of curvature; CRoC, coronal radius of curvature