Table 1.

eGFR formulae used in this study.

Name	Formula
IDMS-traceable “Short” Schwartz (eGFR_Schwartz_Short) (9)	= 41.3 * (height [m]/serum creatinine $\left[\frac{mg}{dL}\right]$
Schwartz-Lyon (eGFR_SchL) (10)	= k* (height [m]/serum creatinine $\left[\frac{mg}{dL}\right]$ with k = 41.3 for boys >13 years of age and k = 36.7 for all others
Full-age-spectrum with Q-age extension (eGFR_FAS_QA) (11)	= $107.3/serumcreatinine\left[\frac{mg}{dl}\right]/Q\left[\frac{mg}{dL}\right]$ with Q = 0.21+0.057 * age (years)−0.0075 * age2+0.00064 * age3−0.000016 * age4 for boys with Q = 0.23+0.034 * age (years)−0.0018 * age2+0.00017 * age3−0.0000051 * age4 for girls
Full-age-spectrum with Q-height extension (eGFR_FAS_QH) (11)	= $107.3/serumcreatinine\left[\frac{mg}{dl}\right]/Q\left[\frac{mg}{dL}\right]$ with Q = 3.94−13.4 * height [m]+17.6 * height2−9.84 * height3+2.04 * height4
Lund-Malmö (eGFR_LM) (12)	= eZ−0.0124* age [years]+0.339* ln(age) if male = eZ−0.0124* age [years]+0.339* ln(age)−0.226 if female with e = the base of the natural logarithm (ln) and Z = 4.62−0.00112 * $serumcreatinine\left[\frac{mg}{dL}\right]$ if serum creatinine <150 μmol/L Z = 8.17+0.0005 * serum creatinine−1.07 * in (serum creatinine) $\left[\frac{mg}{dL}\right]$) if serum creatinine ≥ 150 μmol/L
Lund-Malmö with lean body mass (eGFR_LM_LBM) (12)	= eZ−0.00587* age [years]+0.00977* LBM with e = the base of the natural logarithm (ln) and Z = 4.95−0.0110 * $serumcreatinine\left[\frac{mg}{dL}\right]$ if serum creatinine < 150 μmol/L Z = 8.58+0.0005 * serum creatinine−1.08 * (serum creatinine) $\left[\frac{mg}{dL}\right]$) if serum creatinine ≥ 150 μmol/L with lean body mass (LBM) = 1.07 * weight [kilogramm]−148 * (weight/height [m])2
Measured creatinine Clearance (16) (UCC)	= (urinary creatinine $\left[\frac{mg}{dL}\right]$ * urine volume [ml] /(serum creatinine $\left[\frac{mg}{dL}\right]$ * time [min]) * 1.73/BSA