Table 2. Clinical characteristics of the study population.

Variables	Value
Male gender (%)	50.6
Diagnosis (%)
Non LN-GN	33
LN	22
Non-GN	32
Age (years, median[IQR])	12.0 [10,15]
Height (m, median[IQR])	1.462 [1.343,1.572]
Body weight (kg, median[IQR])	42.0 [27.9, 52.8]
BSA*(m2, median[IQR])	1.310 [1.005, 1.501]
CrE (mg/dL, median[IQR])	0.536[0.425,0.764]
H(m)/CrE(mg/dL), median[IQR])	3.12 [2.24, 4.65]
CrJ (mg/dL, median[IQR])	0.622 [0.532, 0.814]
sCysC (mg/L, median[IQR])	0.86 [0.75,1.20]
BUN (mg/dL, median[IQR])	4.5 [3.6,5.8]
mGFR (ml/min per 1.73m2, mean±SD)	97.0± 31.9

* calculated as described in Methods;

IQR, interquatile range; LN, lupus nephritis; GN, glomerulonephritis; BSA, body surface area; BMI, body mass index; CrE, enzymatic serum creatinine traceable to IDMS;CrJ, Jaffe-method serum creatitine, sCysC, serum cystatin C; mGFR, normalized measured GFR.