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Table 6 Validation group: Correlations, bias, precision and accuracy of the different GFR prediction methods and measured 24hU-CrCl without statistical single data point outlier

From: Quantification of excretory renal function and urinary protein excretion by determination of body cell mass using bioimpedance analysis

   Correlation coefficient R SEE BIAS median difference ABSOLUTE BIAS PRECISION IQR (P25, P75) of differences ACCURACY
P15 (%) P30 (%)
All subjects (N = 30) mCrCl 0.972*** 9.0 0.1 4.3 6.9 (-4.4, 2.5) 27 (90)a 30 (100)bcd
4vMDRD 0.974*** 8.7 −8.6 8.6 14.4 (-19.7, -5.3) 8 (27) 17 (57)
CKD-EPI 0.974*** 8.7 −7.1 7.1 12.9 (-17.1, -4.2) 9 (30) 17 (57)
CG-CrCl 0.971*** 9.3 −4.8 6.6 9.1 (-9.0, 0.1) 17 (55) 28 (93)
Female (N = 15) mCrCl 0.952*** 5.6 −0.6 1.8 6.3 (-4.2, 2.1) 14 (93) 14 (93)
4vMDRD 0.951*** 4.8 −6.4 6.4 6.1 (-10.3, -4.2) 5 (33) 11 (73)
CKD-EPI 0.929*** 6.7 −5.3 5.3 6.2 (-8.8, -2.7) 5 (33) 11 (73)
CG-CrCl 0.952*** 6.7 −1.6 2.8 8.0 (-6.2, 1.8) 8 (53) 13 (87)
CrCl > 60 (N = 10) mCrCl 0.638* 14.0 −0.4 11.5 15.3 (-11.7, 3.5) 9 (90) 10 (100)
4vMDRD 0.668* 13.6 −23.2 23.2 21.4 (-35.3, -13.9) 2 (20) 8 (80)
CKD-EPI 0.660* 13.7 −18.7 18.7 22.3 (-25.8, -3.5) 4 (40) 10 (100)
CG-CrCl 0.771** 11.6 −8.7 8.7 14.9 (-20.6, -5.7) 4 (40) 10 (100)
BMI > 30 (N = 7) mCrCl 0.995*** 5.2 −0.4 1.5 (-15.5, 1.5)†† 7 (100) 7 (100)
4vMDRD 0.991*** 7.4 −10.5 10.5 (-42.0, -4.2)†† 0 3 (43)
CKD-EPI 0.995*** 5.4 −9.1 9.1 (-34.0, -4.2)†† 0 6 (86)
CG-CrCl 0.987*** 8.9 −7.1 7.1 (-26.6, 6.1)†† 4 (57) 7 (100)
  1. ***p < 0.001; **p < 0.01; *p < 0.05;
  2. displayed in mL/min/1.73 m2; ††(Minimum, Maximum)
  3. ap < 0.005 vs the three other methods; bp = 0.12 vs 4vMDRD; cp = 0.34 vs CKD-EPI; dp = 0.8 vs CG