TF and hypertensive disorder: Univariate linear regression showed that blood Mn level was correlated with age (β = −0.049, p < 0.001), smoking (β = −1.588, p = 0.009), hypertension (β = −1.470, p = 0.006), serum TIBC (β = 0.025, p < 0.001), serum transferrin (β = 0.029, p < 0.001), and eGFR (β = 0.036, p < 0.001).