Table 3. Comparison among the perfusion parameters.

Perfusion parameter	Normal renal cortex vs renal tumor		RCC vs AML with minimal fat		Four different pathologic types
	Mean difference (95% CI)	P value	Mean difference (95% CI)	P value	P value
Equiv BV	24.8 (−35.1 – −24.4)	<0.001	20.4 (1.2–39.6)	0.038	<0.001
Ps(clearance)	60.0 (−130.5 – −104.7)	<0.001	−3.63 (−52.6–45.4)	0.883	0.147
BF	102.1 (−115.7 – −71.7)	<0.001	21.7 (−65.5–108.9)	0.622	<0.001

The paired-samples t-test was used to compare perfusion parameters between normal cortex and tumor, and an independent-samples t-test was used to compare RCC and AML with minimal fat.

The Kruskal–Wallis test was used among the four different pathologic types of tumor.