Table 5.

Logistic regression model of variables associated with overall mastectomy

Variable	T	Standard error	Wald	p	Odds ratio (95% CI)
MRI	1.472	0.170	75.022	< 0.001	4.36 (3.12–6.08)
High familial riska	1.372	0.498	7.599	0.006	3.95 (1.49–10.47)
Premenopausal	0.478	0.155	9.571	0.002	1.61 (1.19–2.18)
ACR breast density category b	0.539	0.253	4.529	0.033	1.72 (1.04–2.82)
ACR breast density category c	0.423	0.266	2.523	0.112	1.53 (0.91–2.57)
ACR breast density category d	0.927	0.313	8.761	0.003	2.53 (1.37–4.67)
Lobular histology	0.467	0.178	6.859	0.009	1.60 (1.13–2.26)
Tumor size on final pathology ≥ 20 mm	0.738	0.140	27.926	< 0.001	2.09 (1.59–2.75)
Planned mastectomy on conventional imaging	6.386	0.716	79.616	< 0.001	594.65 (146.00–2414.15)
Constant	–4.128	0.261	249.319	< 0.001	0.016

Nagelkerke R² = 59.4%. Area under the curve = 0.884

ACR American College of Radiology; CI confidence interval; MRI magnetic resonance imaging

^a Three or more first-degree relatives with breast or ovarian cancer