Baseline characteristics of the cohort as classified by the levels of hemoglobin (Hb groups).

Continuous variables are noted as mean ± SD. Categorical variables are presented as n (%). CVD, cardiovascular diseases; ESA, erythropoiesis-stimulating agent; ERI, ESA responsiveness index; TSAT, transferrin saturation; hs-CRP, high-sensitivity C-reactive protein.* Significant difference between a, b, and c (ANOVA, Scheffé test);** significant difference among the five groups (Chi-square test).Baseline characteristics of the cohort as classified by the levels of hemoglobin (Hb groups).