Table 2 Renal depth, renal depth difference, and GFR values were determined by the four methods (\(\bar{\hbox{x}}\pm\hbox{s}\))

64.76 ± 21.07^a

30.70 ± 12.48^a

34.06 ± 12.75^a

5.94 ± 0.91^a

5.98 ± 0.91^a

0.04 ± 0.02^a

81.89 ± 25.57

38.93 ± 15.40

42.96 ± 15.58

7.34 ± 1.20

7.34 ± 1.11

0.07 ± 0.05^b

81.68 ± 26.63

39.04 ± 16.00

42.64 ± 16.06

7.31 ± 1.26

7.29 ± 1.19

0.49 ± 0.37

80.52 ± 25.98

38.60 ± 15.56

41.93 ± 15.41

7.29 ± 1.31

7.26 ± 1.19

0.39 ± 0.33