Figure 1

Serum levels of total and free indoxyl sulfate (IS) in maintenance haemodialysis patients receiving AST-120 treatment.
Serial changes in the serum levels of total IS ((A) Group I, (B) Group II, n = 10 per group) and free IS ((D) Group I, (E) Group II, n = 10 per group) and a comparison between the serum levels before and those after AST-120 use in the predialysis session ((C) total IS, (F) free IS, n = 20). P values were calculated using the Wilcoxon signed-rank test.