Table 4.

Predictors of Multiple Breast Surgeries (N=45,542)^*

Parameter		OR	95% CI
Initial Needle Biopsy		0.35	0.34	0.37
Patient Characteristics
Age at diagnosis		0.95	0.95	0.96
Tumor Characteristics
Stage	Stage 0	0.84	0.77	0.91
	Stage 1	1.10	1.03	1.18
	Stage 2	-	-	-
Tumor size	< 2 cm	1.33	1.12	1.59
	2–5 cms	0.81	0.68	0.96
	missing	1.54	1.26	1.87
	> 5 cms	-	-	-
Histology	Ductal	0.85	0.80	0.89
	Lobular	0.94	0.87	1.02
	Other	-	-	-
Grade	Other/Unknown	1.01	0.95	1.07
	Grade 1	0.99	0.92	1.05
	Grade 2	0.97	0.92	1.03
	Grade 3	-	-	-
System Characteristics
Geographic Region	Northeast	0.81	0.76	0.86
	South	1.05	0.96	1.14
	Midwest	1.13	1.07	1.18
	West	-	-
Year of diagnosis		1.03	1.02	1.04
Received care in teaching hospital	No	0.89	0.83	0.95
	Yes	0.97	0.93	1.02
	Missing	-	-	-

^*Likelihood Ratio chi-square 3867.18, 18 d.f., p < .0001, c-statistic 0.66.

Parsimonious model reported: independent variables not significant in univariate or multivariable analyses removed.