Table 2.

Association between MRI features and percentages of tumor cells with clear cell cytoplasm, alveolar growth, and tubular growth * statistically significant at type-I error of 0.05 using nonparametric median test

	MRI Feature		n	Clear Cell Percentage				Alveolar Percentage				Tubular Percentage
				Mean	Median	SD	p-value	Mean	Median	SD	p-value	Mean	Median	SD	p-value
R1	Necrosis	Y	28	39.8	25.0	35.4	<0.001*	40.9	25.0	39.1	0.70	17.7	10.0	26.5	0.60
		N	47	77.0	95.0	33.6		43.9	45.0	42.1		26.4	10.0	33.0
R2	Necrosis	Y	29	38.8	20.0	35.2	<0.001*	39.5	25.0	39.2	0.54	18.1	10.0	26.1	0.80
		N	46	78.5	97.0	32.5		44.9	45.0	42.1		26.3	10.0	33.4
	Kappa=0.97
R1	Microscopic fat	Y	35	63.5	90.0	38.5	0.93	54.1	70.0	40.6	0.03*	24.6	10.0	33.1	0.70
		N	40	62.7	85.0	39.3		32.9	10.0	38.7		21.9	10.0	29.1
R2	Microscopic fat	Y	40	58.5	60	37.6	0.12	51.4	64.0	41.1	0.13	18.4	5.0	27.9	0.07
		N	35	68.4	90	39.7		33.0	10.0	38.7		28.6	10.0	33.4
	Kappa=0.60
R1	Retroperitoneal collaterals	Y	29	36.7	20.0	34.6	<0.001*	46.5	30.0	40.8	0.37	10.9	5.0	16.5	0.10
		N	46	79.8	95.0	31.2		40.4	17.0	41.0		30.9	10.0	35.2
R2	Retroperitoneal collaterals	Y	29	37.9	30.0	34.1	<0.001*	46.7	30.0	40.6	0.74	12.6	5.0	18.9	0.14
		N	46	79.0	95.0	32.6		40.3	17.0	41.1		39.8	10.0	35.0
	Kappa=0.94
R1	Renal vein thrombosis	Y	10	22.0	15.0	21.9	<0.001*	43.5	22.5	43.2	0.52	5.0	0.0	8.2	0.056
		N	65	69.4	90.0	36.8		42.7	30.0	40.8		25.9	10.0	32.1
R2	Renal vein thrombosis	Y	7	17.1	5.0	22.0	<0.01*	46.4	25.0	45.0	0.72	5.0	0.0	9.6	0.12
		N	68	67.8	90.0	36.9		42.4	27.5	40.7		25.0	10.0	31.7
	Kappa=0.80

R1= Reviewer 1; R2=Reviewer 2.