Significance and prognostic value of increased serum direct bilirubin level for lymph node metastasis in Chinese rectal cancer patients

Figure 2 Association between concentrations of increased serum direct bilirubin and lymph node metastasis. Patients were separated into four groups based on the concentration of direct bilirubin (DBil), including DBil ≤ 1.50 μmol/L, 1.50 μmol/L < DBil ≤ 2.50 μmol/L, 2.50 μmol/L < DBil ≤ 3.50 μmol/L, and DBil > 3.50 μmol/L. The histograms indicate the percentages of patients with lymph node metastasis (LNM) in each group.