Table 2.

Spearman rank correlations between uremic retention solutes

UreaCreatinineIS, TotalIS, FreeIS, fpCS, TotalpCS, FreepCS, f
Urea1.00
Creatininer = 0.37, P = 0.0021.00
Indoxyl sulfate, totalr = 0.30, P = 0.01r = 0.47, P < 0.0011.00
Indoxyl sulfate, freer = 0.38, P = 0.001r = 0.37, P = 0.001r = 0.81, P < 0.0011.00
Indoxyl sulfate, fr = 0.33, P = 0.005r = 0.13, P = 0.3r = 0.3, P = 0.02r = 0.73, P < 0.0011.00
p-cresyl sulfate, totalr = 0.21, P = 0.08r = 0.21, P = 0.08r = 0.02, P = 0.9r = 0.30, P = 0.01r = 0.56, P = < 0.0011.00
p-cresyl sulfate, freer = 0.28, P = 0.02r = 0.21, P = 0.08r = 0.15, P = 0.20r = 0.54, P < 0.001r = 0.76, P < 0.001r = 0.93, P < 0.0011.00
p-cresyl sulfate, fr = 0.38, P = 0.001r = 0.27, P = 0.03r = 0.44, P < 0.001r = 0.54, P < 0.001r = 0.92, P < 0.001r = 0.62, P < 0.001r = 0.84, P < 0.0011.00
  • IS, indoxyl sulfate; pCS, p-cresyl sulfate; f, free fraction.