Table 1.

Intra- and inter-reader bias and variability in kidney volume measurements

	Intra-reader Differences in Kidney Volume Measurements (mL)						Inter-reader Differences in Kidney Volume Measurements (mL)
	Pregadolinium			Postgadolinium			Pregadolinium			Postgadolinium
	Right	Left	Total	Right	Left	Total	Right	Left	Total	Right	Left	Total
Mean (bias)	10.88	3.74	14.62	−4.15	−5.34	−9.49	6.64	2.91	9.56	14.55	15.80	30.36
SD (variability)	14.1	16.5	22.7	10.5	13.8	22.1	16.0	21.7	30.0	18.0	20.0	34.4
P value	0.003	0.323	0.010	0.093	0.101	0.070	0.078	0.554	0.171	0.002	0.002	0.001
Mean % Change (bias)	1.71	0.52	1.06	−0.78	−0.68	−0.69	1.24	0.85	1.04	2.99	2.85	2.89
SD % Change (variability)	2.3	1.8	1.5	1.6	1.8	1.46	3.3	2.8	2.5	3.1	2.7	2.4
P value	0.003	0.206	0.004	0.043	0.115	0.047	0.106	0.188	0.083	0.000	0.000	0.000