Table 1.

Inter-subject variability in flexion-extension and anterior-posterior translation before and after accounting for disc height and static orientation in 18 control subjects.

	Inter-Subject Variability
	Flexion-Extension Rotation			Anterior-Posterior Translation
Motion Segment	Before Adjustment	After Adjustment	Decrease in Variability	Before Adjustment	After Adjustment	Decrease in Variability
C2/C3	2.1°	1.3°	38%	0.9 mm	0.7 mm	22%
C3/C4	3.5°	2.5°	29%	1.0 mm	0.8 mm	20%
C4/C5	2.9°	1.9°	34%	0.7 mm	0.6 mm	14%
C5/C6	2.6°	1.4°	46%	0.6 mm	0.4 mm	33%
C6/C7	2.9°	2.6°	10%	0.5 mm	0.4 mm	20%