Table 2. Significant different imaging characteristics between patients with clear-cell and non-clear-cell renal cell carcinoma.

Characteristic	Clear-cell subtype	Non-clear-cell subtype	p (uncorrected/corrected)
Mean attenuation [HU]			.017/ < .001
Mean±SD	89.36±37.47	71.94±23.49
Median	86.55	66.03
Range	12.65–190.2	23.95–128.7
Skewness			.194/.028
Mean±SD	-0.25±0.42	-0.13±0.47
Median	-0.28	-0.15
Range	-1,15–1	-1.1–0.8
Entropy			.031/.12
Mean±SD	6.7±0.37	6.54±0.26
Median	6.61	6.5
Range	5.75–7.59	6.08–7.13
MPP			.015/ < .001
Mean±SD	90.68±36.3	73.51±22.42
Median	86.98	67.7
Range	22.05–190.2	37.45–128.7
UPP			.023/.922
Mean±SD	0.012±0.003	0.015±0.009
Median	0.012	0.013
Range	0.006–0.027	0.008–0.061

Abbreviations: MPP—mean of positive pixels; UPP—uniformity of distribution of positive gray-level pixel values.