Table 2.

Multivariate analysis examining the likelihood of undergoing sentinel node biopsy and the factors predicting node positivity in patients who underwent sentinel node biopsy

Variable	Odds ratio		Odds ratio
	Sentinel node biopsy	P value	Positive lymph nodes	P value
Age	0.876	< 0.001	0.981	< 0.001
Race	ref	ref	ref	ref
Black	1.029	0.555	0.724	< 0.001
Other	1.184	< 0.001	0.74	< 0.001
White
Insurance	ref	ref	ref	ref
Medicaid	1.176	0.016	0.735	< 0.001
Medicare	0.783	0.094	1.115	0.535
Not Insured	1.123	0.37	0.877	0.409
Other government	1.126	0.095	0.763	0.002
Private
Charlson-Deyo	ref	ref	ref	ref
0	0.887	< 0.001	1.097	< 0.001
1	0.713	< 0.001	1.031	0.528
2	0.676	< 0.001	1.006	0.924
3
Facility type	ref	ref	ref	ref
Academic/Research	1.34	< 0.001	1.077	0.061
Community	1.369	< 0.001	0.969	0.219
Comprehensive community	1.401	< 0.001	0.963	0.202
Integrated network
Facility location	ref	ref	ref	ref
East central	1.121	< 0.001	0.954	0.167
Middle Atlantic	1.03	0.438	1.142	0.007
Mountain	0.55	< 0.001	0.784	< 0.001
New England	1.158	< 0.001	1.02	0.574
Pacific	1.425	< 0.001	1.088	0.004
South Atlantic	1.491	< 0.001	1.148	< 0.001
West Central
Hormonal status	ref	ref	ref	ref
ER-PR+HER2-	0.712	0.002	0.982	0.894
ER+PR-HER2-	0.697	0.001	1.033	0.807
ER+PR+HER2-
Histology	ref	ref	ref	ref
IDC	1.15	< 0.001	0.957	0.143
ILC

IDC Invasive ductal carcinoma, ILC invasive lobular carcinoma, ER Estrogen receptor, PR Progesterone receptor, HER2 Human epidermal growth factor receptor, ref Reference, T Tumor, p Pathologic, a/b/c Tumor substage, o Other (not T1a/T1b/T1c), + indicates positive expression, − indicates negative expression