Figure 2.

PBHCit concentrations in healthy persons with normal renal function (n=90) and patients undergoing MHD (n=347). Shown are box whisker plots for each group. The box represents the interquartile range, the line within the box is the median level, and the whiskers represent a length equal to 1.5 times the interquartile range (the difference between the 25th and 75th percentiles) or the lowest value per the method of Tukey. The P value represents the Wilcoxon rank sum comparison between groups.