Relative amounts of RBP4-L and RBP4-LL in controls, patients with chronic liver disease (CLD) and chronic kidney disease (CKD). The intensities of RBP4-L and RBP4-LL in the sera of the CLD group, the CKD and the control group were calculated in relation to the peak height of the non-truncated RBP4 peak (21.065 Da), which was set 100%. The peak heights of RBP4-L and RBP4-LL are expressed as percentage of the non-truncated RBP4. All peak heights were determined in a "valley-to-valley" procedure. Boxes represent interquartile range with median (white bar); black dots represent single values of each subject.