Table 5.

Risk of contralateral invasive breast cancer: effect of time to breast cancer event

Time to breast cancer event (mo)
>6
>12
>24
>36
Breast densityn = 52n = 51n = 48n = 43
BI-RADS 1, 21.001.001.001.00
BI-RADS 3, 4 (95% CI)3.2 (1.7-6.2)3.1 (1.6-5.9)2.9 (1.5-5.7)2.6 (1.3-5.1)