Diagnostic value of magnetic resonance diffusion tensor imaging in evaluation of cervical spondylotic myelopathy

Egyptian Journal of Radiology and Nuclear Medicine

Table 2 ADC values in patients and control groups at different cervical spinal cord segments

Disc level	Control	Patients		Statistical tests
Disc level	Normal discs	not affected disc	Affected disc	Test statistic	p value	Post hoc test
C2–3
N	30	60	0	T = 0.213	0.832	–
Mean ± SD	0.945 ± 0.082	0.949 ± 0.071
Min–Max	0.844–1.050	0.810–1.240
C3–4
N	30	34	26	F = 28.731	< 0.001*	P1 = 0.670 P2 < 0.001* P3 < 0.001*
Mean ± SD	1.038 ± 0.023	1.023 ± 0.070	1.630 ± 0.279
Min–Max	0.999–1.090	0.878–1.130	1.120–2.060
C4–5
N	30	30	30	F = 48.167	< 0.001*	P1 = 0.087 P2 < 0.001* P3 < 0.001*
Mean ± SD	1.097 ± 0.063	1.189 ± 0.115	1.687 ± 0.231
Min–Max	1.010–1.190	1.050–1.400	1.120–2.050
C5–6
N	30	12	48	F = 21.953	< 0.001*	P1 = 0.521 P2 < 0.001* P3 < 0.001*
Mean ± SD	1.171 ± 0.037	1.117 ± 0.114	1.607 ± 0.317
Min–Max	1.110–1.230	1.030–1.290	1.080–2.050
C6–7
N	30	30	30	F = 29.885	< 0.001*	P1 = 0.209 P2 < 0.001* P3 < 0.001*
Mean ± SD	1.003 ± 0.186	1.109 ± 0.194	1.675 ± 0.305
Min–Max	0.874–1.580	0.920–1.720	1.070–2.140
All levels
N	150	166	134	F = 136.534	< 0.001*	P1 = 0.992 P2 < 0.001* P3 < 0.001*
Mean ± SD	1.051 ± 0.123	1.049 ± 0.144	1.644 ± 0.285
Min–Max	0.844–1.580	0.810–1.720	1.070–2.140

F One-way ANOVA test, SD standard deviation, T Independent Samples-T test
*Significant at < 0.05. Post hoc test: Games–Howell test; p1: p value from post hoc test comparing control and not affected discs; p2: p value from post hoc test comparing control and affected discs; p3: p value from post hoc test comparing not affected and affected discs