Table 2. Area of segmented adipose tissue in non-enhanced and contrast-enhanced scans (for 2D-segmentation).

Variables	NES (dm2)	CES (dm2)	Change (%)	P	95% CI (%)	R2	P	Conversion formula	RMSEtrain (dm2)	RMSEtest (dm2)
NES vs. ART (n=23)
TAT	3.92±1.52	4.08±1.50	−2.32 (3.63)	0.005	−3.68, −0.75	0.997	<0.001	0.124+0.987*ART	0.10	0.14
VAT	1.93±0.92	2.01±0.91	−3.51 (3.62)	<0.001	−6.41, −2.42	0.989	<0.001	0.099+0.994*ART	0.10	0.05
SAT	2.00±0.94	2.07±0.99	+0.85 (3.66)	0.64	−1.52, 2.45	0.997	<0.001	0.061+0.969*ART	0.05	0.11
NES vs. PVN (n=10)
TAT	3.92±1.52	3.91±1.65	−2.69 (2.29)	0.008	−4.84, −0.97	0.997	<0.001	−0.047+1.040*PVN	0.12	0.08
VAT	1.93±0.92	1.69±0.92	−6.68 (6.72)	0.11	−13.94, 1.73	0.951	<0.001	−0.129+1.202*PVN	0.20	0.73
SAT	2.00±0.94	2.22±0.95	−0.28 (5.93)	0.92	−7.81, 7.70	0.993	<0.001	−0.055+1.030*PVN	0.09	0.58
NES vs. VEN (n=31)
TAT	3.92±1.52	3.73±1.53	−6.33 (6.42)	<0.001	−9.01, −3.90	0.987	<0.001	0.269+0.978*VEN	0.19	0.16
VAT	1.93±0.92	1.77±0.92	−10.91 (10.47)	<0.001	−16.15, −6.91	0.931	<0.001	0.215+0.972*VEN	0.23	0.18
SAT	2.00±0.94	1.97±0.97	−0.31 (7.19)	0.11	−4.67, 0.48	0.986	<0.001	0.056+0.990*VEN	0.11	0.19

Data are mean ± standard deviation in dm² or median in% and (interquartile range in percentage points). ART, arterial scan; CES, contrast-enhanced scan; CI, confidence interval; NES, non-enhanced scan; PVN, portal-venous scan; R², coefficient of determination; RMSE, root-mean-square error; SAT, subcutaneous adipose tissue; TAT, total adipose tissue; test, test data; train, training data; VAT, visceral adipose tissue; VEN, venous scan. The first P value column (and 95% CI) corresponds to the relative change between CES and NES while the second P value column corresponds to the difference of the correlation coefficient R from zero. All conversion formulae calculate NES area in dm².