TABLE 5.

Amplitude values of axial and sagittal measurements, ICCs, and Bland‐Altman coefficients in each cervical segment in stenotic and nonstenotic segments

Nonstenotic segments
		Axial		Sagittal		Bland‐Altman coefficients				Intraclass correlation coefficients
Segment	N	Mean	SD	Mean	SD	Mean	SD	1.96 × SD	p	ICC	CImin	CImax	p
C2	62	0.51	0.28	0.48	0.25	0.02	0.12	0.23	.186	.902	.842	.940	<.001
C3	24	0.63	0.24	0.58	0.23	0.06	0.10	0.19	.010	.896	.719	.958	<.001
C4	22	0.69	0.34	0.83	0.40	–0.14	0.27	0.53	.004	.687	.353	.861	<.001
C5	7	0.80	0.48	0.82	0.43	–0.02	0.07	0.13	.378	.990	.948	.998	<.001
C6	21	0.74	0.41	0.76	0.40	–0.02	0.20	0.39	.903	.883	.734	.951	<.001

Stenotic segments
		Axial		Sagittal		Bland‐Altman coefficients				Intraclass correlation coefficients
Segment	N	Mean	SD	Mean	SD	Mean	SD	1.96 × SD	p	ICC	CImin	CImax	p
C2	0	na	Na	na	na	na	na	na	na	na	na	na	na
C3	19	1.09	0.72	0.99	0.73	0.10	0.27	0.52	.049	.928	.822	.972	<.001
C4	29	0.94	0.54	1.03	0.61	–0.09	0.31	0.62	.115	.842	.691	.923	<.001
C5	47	1.08	0.54	1.07	0.54	0.02	0.20	0.39	.587	.934	.884	.962	<.001
C6	20	1.06	0.47	1.00	0.39	0.06	0.23	0.46	.277	.849	.663	.937	<.001

Note: The motion amplitude values in subgroups with measurements in nonstenotic (upper table) and stenotic (lower table) segments are reported per cervical segment for axial and sagittal measurements. The amplitude difference between axial minus sagittal measurements was significantly different from 0 at segment C3 and C4 in nonstenotic segments and at segment C3 in stenotic segments. Intraclass correlation coefficients (ICCs; two‐way mixed model, single measures, absolute agreement) with its 95% confidence interval (CI) are presented for each cervical segment.

Abbreviations: N, number of measurements; SD = standard deviation.