Table 2.

Accuracy and reliability of the semi-automated segmentation and volumetry of the kidney parenchyma

		N	Min.	5th percentile	Mean	95th percentile	Max.	SD	p value (two-tailed)
Accuracy (agreement with reference volume)	Reader 1	96	−11.8	−10.7	0.4	11.1	21.0	6.2	0.54
	Reader 2	96	−11.7	−10.0	−0.1	7.7	9.7	4.8	0.84
	Reader 3	96	−12.4	−6.0	0.6	9.9	15.1	4.6	0.17
	Total	288	−12.4	−8.4	0.3	9.5	21.0	5.2	0.31
Intra-reader reliability	Reader 1	48	−16.4	−12.9	−1.2	6.1	7.4	5.5	0.12
	Reader 2	48	−12.8	−11.3	−0.6	7.7	9.3	5.4	0.45
	Reader 3	48	−15.3	−10.0	0.7	7.1	8.9	4.7	0.29
	Total	144	−16.4	−11.3	−0.4	6.5	9.3	5.2	0.40
Inter-reader reliability	Reader 1 vs. 2	192	−14.7	−9.6	0.5	9.6	21.9	5.9	0.26
	Reader 1 vs. 3	192	−17.5	−11.0	−0.3	12.7	26.8	7.3	0.63
	Reader 2 vs. 3	192	−19.3	−11.3	−0.7	8.3	15.8	5.9	0.08
	Total	576	−19.3	−10.7	−0.2	9.8	26.8	6.4	0.52