Figure 4.Nonlinear regression and Spearman's rank-order correlation of (A) R1 (B) R2 and (C) R2* with iron in the basal ganglia. A significant positive correlation of iron was found for all MR relaxation rates, but nonlinear regression demonstrated R2* to have the greatest predictive value for iron. Significance level of correlation at ***, P < 0.001.
