The change of plasma IL-6 concentration Cytokine Times IL-6, median (25th-75th), n=31 Friedman Test T1 665.1 (147.73 - 1095.0) χ2 = 4.237 p = 0.237 (>0, 05) T2 470.66 (126.74 - 1021.0) T3 480.44 (114.93 - 1153.24) T4 371.23 (70.8 - 1207.54) Comment: The median value of the IL-6 concentration tends to decrease gradually during hemofiltration, but this difference is not statistically significant.