Table 3 Bias, precision and accuracy of the estimating equations in the whole group and according to the glomerular filtration rate cut-off value of 60 ml/min/1.73 m ² determined by iohexol clearance

4.6 (1.7 to 7.5)*

5.9 (2.2 to 9.7)*

2.7 (-2.1 to 7.5)

1.7 (-1.0 to 4.4)

3.6 (1.8 to -0.1)

-1.0 (-5.1 to 3.1)

-6.6 (-8.9 to -4.3)*

-1.9 (-4.6 to 0.9)

-13.4 (-16.4 to -10.4)*

-7.4 (-10.3 to -4.4)*

-6.3 (-9.9 to -2.7)*

-8.9 (-14.1 to -3.7)*

-4.0 (-6.4 to -1.6)*

-2.7 (-5.9 to 0.5)

-5.9 (-9.6 to -2.3)*

-8.3 (-10.5 to -6.0)*

-4.3 (-7.0 to -1.6)*

-13.9 (-17.1 to -10.7)*

14.4 (12.6 to 16.1)

14.1 (11.5 to 16.5)

14.8 (12.0 to 16.8)

13.3 (11.7 to 14.9)

13.6 (11.2 to 15.7)

12.7 (10.3 to 14.4)

11.4 (10.0 to 12.6)

10.4 (8.6 to 12.0)

9.3 (7.8 to 10.4)

14.5 (11.6 to 17.7)

13.4 (9.0 to 18.7)

16.1 (12.1 to 18.8)

11.7 (9.7 to 14.1)

12.0 (9.0 to 15.4)

11.3 (7.9 to 13.4)

11.0 (9.3 to 12.9)

10.1 (7.7 to 12.9)

9.9 (7.4 to 11.8)

15.1 (13.9 to 16.3)

15.3 (13.5 to 17.2)

15.0 (13.5 to 16.5)

13.5 (12.5 to 14.5)

14.0 (12.5 to 15.5)

12.7 (11.4 to 14.0)

13.2 (12.1 to 14.3)

10.6 (9.5 to 11.7)

16.3 (14.2 to 18.4)

16.3 (15.0 to 17.6)

14.8 (13.0 to 16.6)

18.4 (16.4 to 20.4)

12.4 (11.4 to 13.4)

12.3 (10.8 to 13.7)

12.7 (11.3 to 14.1)

13.8 (12.7 to 14.9)

11.2 (9.9 to 12.5)

17.1 (15.1 to 19.1)

70.5 (60.7 to 78.7)^ad

64.3 (51.2 to 75.5)^bcf

79.5 (64.5 to 89.2)

74.7 (65.2 to 82.3)^b

64.3 (51.2 to 75.5)^bce

89.7 (76.4 to 95.9)

80.0 (70.9 to 86.8)

78.6 (66.2 to 87.3)

82.1 (67.3 to 91.0)

65.3 (55.3 to 74.1)^acf

60.7 (47.6 to 72.4)^bc

71.8 (56.2 to 83.4)^b

85.3 (77.0 to 91.3)

80.4 (68.2 to 88.7)

92.3 (79.7 to 97.3)

83.2 (74.6 to 89.7)

85.7 (74.3 to 92.6)

79.5 (64.5 to 89.2)