Fig. 1
From: Tubular secretion of creatinine and kidney function: an observational study
Distribution of iGFR, CrCl, as well as CrCl/iGFR ratio stratified by categories of iGFR (a) and by categories of CrCl (b) in 802 AASK, 797 MDRD and 1693 Mayo CKD participants (box plots show median, interquartile range and outliers; whiskers represent the highest and lowest values that are not outliers more than 1.5 box lengths from one hinge of the box). The data in the figure represents the corresponding median CrCl/iGFR ratios