Table 2.

Multivariate logistic regression analyses to predict positive lymph node status at time of surgery in breast cancer patients (n=666^*).

Variable	Multivariate
	OR (95% CI)	P value
Months from imaging to surgery	1.31 (0.95-1.82)	0.1065
Age at diagnosis (years)	0.99 (0.97-1.01)	0.1914
Tumor grade
II or III	1.14 (0.62-2.10)	0.6802
I	1.00
ER status
Positive	2.41 (1.21-4.80)	0.0127
Negative	1.00
PR status
Positive	0.94 (0.56-1.56)	0.8024
Negative	1.00
HER2 status
Positive	1.50 (0.83-2.71)	0.1768
Negative	1.00
Lymphovascular invasion
Yes	3.57 (2.33-5.47)	<.0001
No	1.00
Histologic carcinoma type
Infiltrating lobular	1.77 (1.09-2.88)	0.0205
Other invasive	0.36 (0.10-1.25)	0.1068
Infiltrating ductal	1.00
Sonographic focality
Multifocal	1.30 (0.77-2.19)	0.3226
Unifocal or multicentric	1.00
Imaging size (sonography or mammography if no sonography), cm	1.40 (1.14-1.70)	0.0011

^*Analysis limited to the 666 patients with known variables.