Figure 1.
Urine Protein:Creatinine ratios (Up/c) by iohexol-measured GFR (iGFR) for 328 nonglomerular CKD children and 91 glomerular CKD children, respectively. Nonparametric smoothing splines for the Up/c versus iGFR relationship for each of the CKD diagnosis groups are represented by the small dashed lines. Linear regression models for the nonglomerular and glomerular CKD patients are represented by the solid and large dashed straight lines, respectively. Both the smoothing splines and linear regression lines are drawn from the 5th to the 95th percentile iGFR values.