Table 4.

Multivariable binary logistic regression model of variables associated with reoperation for close or positive margins

		p value	Odds ratio	95% CI
MRI referral	noMRI	Reference	–	–
	Screening MRI	0.452	0.8	0.4–1.5
	Diagnostic MRI	0.029	0.7	0.5–1.0
	Preoperative MRI	< 0.001	0.7	0.6–0.8
Hormonal status	Postmenopausal	Reference	–	–
	Premenopausal	0.021	0.8	0.6–1.0
	Perimenopausal	0.246	0.8	0.6–1.1
Lesion focus at US	No observable lesion	Reference	–	–
	Single focus	0.016	0.8	0.6–1.0
	Multifocal	0.069	0.7	0.5–1.0
	Multicentric	0.029	0.4	0.2–0.9
Largest lesion diameter at US	≥ 20 mm	0.029	0.8	0.6–1.0
Surgical pathology	Pure DCIS	< 0.001	2.5	1.9–3.3
	DCIS associated to invasive cancer	< 0.001	1.8	1.4–2.2
	Largest lesion diameter ≥ 20 mm	< 0.001	1.5	1.2–1.8
	Multifocal or multicentric cancer	0.001	1.5	1.2–1.9
	Lobular component	0.017	1.4	1.1–1.8

CI, confidence interval; US, ultrasonography; MRI, magnetic resonance imaging; DCIS, ductal carcinoma in situ