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

Egyptian Journal of Radiology and Nuclear Medicine

Table 1 FA 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 = 1.417	0.163	–
Mean ± SD	0.652 ± 0.014	0.659 ± 0.022	–
Min–Max	0.648–0.707	0.620–0.702	–
C3–4
N	30	34	26	F = 50.901	< 0.001*	P1 = 0.243 P2 < 0.001* P3 < 0.001*
Mean ± SD	0.612 ± 0.005	0.624 ± 0.029	0.458 ± 0.055
Min–Max	0.601–0.620	0.581–0.660	0.350–0.533
C4–5
N	30	30	30	F = 31.995	< 0.001*	P1 = 0.988 P2 < 0.001* P3 < 0.001*
Mean ± SD	0.598 ± 0.011	0.596 ± 0.050	0.462 ± 0.064
Min–Max	0.570–0.612	0.511–0.676	0.355–0.560
C5–6
N	30	12	48	F = 42.360	< 0.001*	P1 = 0.392 P2 < 0.001* P3 = 0.001*
Mean ± SD	0.590 ± 0.011	0.560 ± 0.050	0.439 ± 0.078
Min–Max	0.560–0.599	0.513–0.616	0.266–0.580
C6–7
N	30	30	30	F = 13.629	< 0.001*	P1 = 0.060 P2 < 0.001* P3 = 0.001*
Mean ± SD	0.590 ± 0.077	0.553 ± 0.028	0.476 ± 0.065
Min–Max	0.500–0.699	0.500–0.599	0.349–0.601
All levels
N	150	166	134	F = 150.897	< 0.001*	P1 = 0.673 P2 < 0.001* P3 < 0.001*
Mean ± SD	0.608 ± 0.042	0.614 ± 0.052	0.456 ± 0.068
Min–Max	0.500–0.707	0.500–0.702	0.266–0.601

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