Fig. 1

Correlations with the plasma erythropoietin level. a Correlation between the plasma erythropoietin (EPO) and erythropoiesis-stimulating agent (ESA). b Correlation between the plasma erythropoietin (EPO) and the serum ferrum level (Fe). c Correlation between the plasma erythropoietin (EPO) and transferrin saturation (TSAT). d Correlation between the plasma erythropoietin (EPO) and body mass index (BMI). e Correlation between the plasma erythropoietin (EPO) and the New York Heart Association (NYHA) classification. ESA erythropoiesis-stimulating agent, EPO plasma erythropoietin level, Fe serum ferrum level, TSAT transferrin saturation, BMI body mass index, NYHA the New York Heart Association