Figure 1
Boxplot of measured and estimated GFR according to several equations. Boxes indicate medians (line inside box), quartiles (upper and lower margins of the box). Vertical lines are 95% confidence intervals. The dotted line represents the GFR cutoff of 60 ml/min/1.73 m2. Abbreviations: mGFR: measured GFR with iohexol, MDRD: Modification Diet in Renal Disease equation, CKD_cr: Chronic Kidney Disease Epidemiology creatinine equation, BIS_cr: Berlin Initiative Study creatinine equation, CKD_cys: Chronic Kidney Disease Epidemiology cystatin C equation, CKD_cr-cys: Chronic Kidney Disease Epidemiology creatinine-cystatin C equation, BIS_cr-cys: Berlin Initiative Study creatinine-cystatin C equation.