Plots demonstrating the spearman correlation of anisotropic stiffness
coefficients with age in gray matter; (a) C11 vs age
with a spearman correlation coefficient of −0.67, p < 0.0001;
(b) C22 vs age with a spearman correlation
coefficient of −0.63, p = 0.0003; (c) C33 vs age
with a spearman correlation coefficient of −0.67, p < 0.0001;
(d) C44 vs age with a spearman correlation
coefficient of −0.68, p < 0.0001; (e) C55
vs age with a spearman correlation coefficient of −0.66, p = 0.0001;
(f) C66 vs age with a spearman correlation
coefficient of −0.67, p < 0.0001; and in thalamus (g)
C33 vs age with a spearman correlation coefficient of
−0.46, p = 0.01.