Table 3.

Variables associated with first-line bilateral mastectomy in the subgroup of breast cancer patients receiving first-line mastectomy

Variable	T	Standard error	Wald	p	Odds ratio (95% CI)
MRI	1.291	0.323	15.960	< 0.001	3.64 (1.93–6.85)
High familial riska	1.554	0.471	10.905	0.001	4.73 (1.88–11.90)
Planned mastectomy on conventional imaging	–0.508	0.223	5.193	0.023	0.60 (0.38–0.93)
Constant	–3.165	0.354	80.058	< 0.001	0.042

Nagelkerke R² = 7.9%. Area under the curve = 0.669

CI confidence interval; MRI magnetic resonance imaging

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