Table 3.

ORs for imaging features associated with nodal metastases

Variables	OR	p-value	Adjusted ORc	p-valuec
Ultrasound (n = 316)
CTRa	3.6 (2.1 to 6.3)	<.001	3.5 (1.9 to 6.3)	<.001
CTDa	3.6 (2.1 to 6.3)	<.001	3.3 (1.8 to 5.9)	<.001
CT-bilateral differenceRb	3.4 (2.0 to 5.7)	<.001	3.0 (1.7 to 5.4)	<.001
CT-bilateral differenceDb	3.4 (2.0 to 5.8)	<.001	2.9 (1.6 to 5.1)	<.001
LD	1.7 (1.0 to 2.7)	.047	1.6 (1.0 to 2.8)	.069
SD	1.4 (0.8 to 2.4)	.187	1.4 (0.8 to 2.5)	.249
LD/SD	2.2 (1.2 to 4.2)	.012	2.1 (1.1 to 4.2)	.032
Eccentricity	2.5 (1.3 to 4.7)	.005	2.4 (1.2 to 4.8)	.011
Fatty hilum loss	25.0 (3.1 to 200.4)	.002	27.2 (2.7 to 269.2)	.005
Irregularity	1.5 (0.6 to 4.0)	.408	1.9 (0.7 to 5.5)	.231
MRI (n = 260)
CTRa	3.7 (2.0 to 6.8)	<.001	3.3 (1.7 to 6.7)	.001
CTDa	4.0 (2.2 to 7.4)	<.001	3.9 (2.0 to 7.7)	<.001
CT-bilateral differenceRb	4.2 (2.3 to 7.6)	<.001	3.7 (1.9 to 7.2)	<.001
CT-bilateral differenceDb	4.3 (2.4 to 7.7)	<.001	4.0 (2.1 to 7.7)	<.001
LD	1.8 (1.0 to 3.1)	.045	1.8 (1.0 to 3.3)	.053
SD	2.3 (1.3 to 4.0)	.004	2.1 (1.2 to 3.9)	.015
LD/SD	2.8 (0.9 to 8.3)	.064	2.7 (0.9 to 8.3)	.088
Eccentricity	3.1 (1.6 to 6.2)	.001	3.0 (1.4 to 6.3)	.004
Fatty hilum loss	2.4 (0.9 o 6.3)	.082	1.9 (0.7 to 5.4)	.241
Irregularity	2.3 (0.8 to 6.4)	.116	1.8 (0.6 to 5.6)	.322

CT, cortical thickness; LD, long diameter; OR, odds ratio; SD, short diameter.

For the calculation of OR, quantitative features (CT^R, CT^D, CT-bilateral difference^R, CT-bilateral difference^D, LD, SD, LD/SD) were divided into binary groups according to each cut-off value.

^aIf the ALN had loss of fatty hilum, two CT features were assessed: radius (CT^R) or SD (CT^D).

^bCT-bilateral difference^R was calculated by CT^R minus CT of contralateral ALN and CT-bilateral difference^D by CT^D minus CT of contralateral ALN.

^cAdjusted for T stage, tumor location, and histologic grade.