Table 2.

Imaging parameters, by reader and by group.

Parameter	Reader	Adenomas (n = 52)	Pheochromocytomas (n = 29)	P
Size (cm), mean ± SD (range)	1	2.53 ± 1.43 (1.2 to 11)	5.32 ± 3.32 (1.4 to 16.0)	< 0.0001
	2	2.42 ± 1.44 (1.0 to 10.6)	5.03 ± 3.12 (1.3 to 14.9)	< 0.0001
Mean attenuation (HU), mean ± SD (range)	1	4.84 ± 15.44 (–27 to 44)	36.58 ± 8.31 (11 to 47)	< 0.0001
	2	5.83 ± 14.81 (–29 to 49)	36.63 ± 8.27 (12 to 49)	< 0.0001
calcP10 (HU), mean ± SD (range)	1	–23.04 ± 16.67 (–54 to 27)	14.55 ± 10.32 (–14 to 34)	< 0.0001
	2	–24.83 ± 17.06 (–64 to 34)	13.32 ± 10.25 (–19 to 30)	< 0.0001
Observed P10 (HU), mean ± SD (range)	1	–23.11 ± 16.51 (–51 to 28)	14.58 ± 10.4 (–15 to 35)	0.01
	2	–24.96 ± 17.0 (–59 to 35)	13.31 ± 10.61 (–20 to 31)	0.001
Calcifications, n (%)	1	1 (1.9)	5 (17.2)	0.01
	2	1 (1.9)	4 (13.8)	0.03
Homogeneity, n (%)	1
	Homogeneous	43 (82.7)	7 (24.1)	< 0.0001
	Heterogeneous	9 (17.3)	22 (75.9)
	2
	Homogeneous	42 (80.8)	7 (24.1)	< 0.0001
	Heterogeneous	10 (19.2)	22 (75.9)
Normality, n (%)	1	45 (86.5)	26 (89.7)	0.67
	2	45 (86.5)	24 (82.8)	0.65