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Table 2: Comparison of diffusion characteristics between neurologically intact control subjects and those with chronic SCI across upper cervical segments (C1–C3)
Diffusion Metric/Level Control Chronic SCI P Value^*
λ_l (10⁻³ mm²/s) 
    C1 1.28 ± 0.07 0.99 ± 0.09 .006
    C2 1.48 ± 0.04 1.10 ± 0.08 <.001
    C3 1.47 ± 0.03 1.16 ± 0.08 .002
λ_t (10⁻³ mm²/s) 
    C1 0.51 ± 0.04 0.35 ± 0.04 .003
    C2 0.59 ± 0.04 0.44 ± 0.04 .004
    C3 0.62 ± 0.04 0.47 ± 0.05 .006
MD (10⁻³ mm²/s) 
    C1 0.77 ± 0.04 0.60 ± 0.06 .009
    C2 0.89 ± 0.03 0.66 ± 0.05 <.001
    C3 0.90 ± 0.03 0.70 ± 0.06 .002
Note:—MD indicates mean diffusivity.
* P values represent the level of significance from the Tukey test for multiple comparisons. Data are reported as mean ± SEM.

Diffusion Metric/Level	Control	Chronic SCI	P Value^*
λ_l (10⁻³ mm²/s)
C1	1.28 ± 0.07	0.99 ± 0.09	.006
C2	1.48 ± 0.04	1.10 ± 0.08	<.001
C3	1.47 ± 0.03	1.16 ± 0.08	.002
λ_t (10⁻³ mm²/s)
C1	0.51 ± 0.04	0.35 ± 0.04	.003
C2	0.59 ± 0.04	0.44 ± 0.04	.004
C3	0.62 ± 0.04	0.47 ± 0.05	.006
MD (10⁻³ mm²/s)
C1	0.77 ± 0.04	0.60 ± 0.06	.009
C2	0.89 ± 0.03	0.66 ± 0.05	<.001
C3	0.90 ± 0.03	0.70 ± 0.06	.002