Table 2. Comparison of the CT-measured KD and the various estimation formulas ($\overline{x}\pm s$).

Formula	KDL (cm)	KDR (cm)	Z (Left/Right)	P (Left/Right)
CT-measured KD	6.99±1.14	7.24±1.15	−	−
Fitting formula	7.05±0.718	7.21±0.748	−1.56/−0.219	0.118/0.826
Taylor’s formula	6.52±0.774*	6.89±0.720*	−5.61/−4.31	0.000/0.000
Li Q’s formula	7.08±0.783	7.11±0.721	−1.42/−1.65	0.156/0.099
Ma G’s formula	7.08±0.809*	7.41±0.820*	−1.99/−2.72	0.047/0.007
Uchiyama’s formula	7.78±0.831*	7.93±0.768*	−8.81/−8.19	0.000/0.000
Xue JJ’s formula	6.78±0.679	7.03±0.685	−1.70/−1.36	0.089/0.175

*P<0.05, compared with the CT-measured KD. CT, computed tomography; KD, kidney depth.