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Table 1: Univariable and multivariable regression models of lymph node metastasis
Variable Univariable Analysis Multivariable Analysis
OR 95% CI P Value OR 95% CI P Value
T-stage 
    1 Reference Reference 
    2 1.13 0.68–1.89 .64 0.97 0.46–2.06 .93
    3 or 4 1.59 0.98–2.59 .06 1.86 0.95–3.77 .07
Shortest axial diameter (cm) 41.29 18.09–94.27 <.001 6.69 2.95–17.31 <.001
Longest axial diameter (cm) 6.59 4.12–10.56 <.001 
L/S ratio 0.07 0.03–0.14 <.001 0.50 0.22–1.10 .09
Longest longitudinal diameter (cm) 4.87 3.36–7.08 <.001 
Conglomeration^a 9.73 3.66–25.84 <.001 
Necrosis 
    No Reference Reference 
    Present 38.99 17.81–85.37 <.001 15.21 6.97–36.60 <.001
    Cystic 82.25 24.88–271.89 <.001 21.76 7.51–84.63 <.001
Infiltration^a 75.54 10.26–556.09 <.001 
Laterality to primary tumor (ipsilateral vs contralateral)^a 2.27 1.37–3.75 <.001 
↵a The reference standard in this study comprised no conglomeration, no infiltration, and no contralateral location to the primary tumor.

Variable	Univariable Analysis			Multivariable Analysis
Variable	OR	95% CI	P Value	OR	95% CI	P Value
T-stage
1	Reference			Reference
2	1.13	0.68–1.89	.64	0.97	0.46–2.06	.93
3 or 4	1.59	0.98–2.59	.06	1.86	0.95–3.77	.07
Shortest axial diameter (cm)	41.29	18.09–94.27	<.001	6.69	2.95–17.31	<.001
Longest axial diameter (cm)	6.59	4.12–10.56	<.001
L/S ratio	0.07	0.03–0.14	<.001	0.50	0.22–1.10	.09
Longest longitudinal diameter (cm)	4.87	3.36–7.08	<.001
Conglomeration^a	9.73	3.66–25.84	<.001
Necrosis
No	Reference			Reference
Present	38.99	17.81–85.37	<.001	15.21	6.97–36.60	<.001
Cystic	82.25	24.88–271.89	<.001	21.76	7.51–84.63	<.001
Infiltration^a	75.54	10.26–556.09	<.001
Laterality to primary tumor (ipsilateral vs contralateral)^a	2.27	1.37–3.75	<.001