Table 3 Mean case risk percentiles for BCRAT and IBIS among subgroups of subjects.
|  | N | BCRAT | IBIS | Pvalueª |
|---|---|---|---|---|
Age (yrs) at risk assignment | ||||
<35 | 7 | 18.8 | 31.2 | 0.2969 |
35-49 | 38 | 56.9 | 66.9 | 0.0377 |
50+ | 38 | 77.7 | 79.1 | 0.7489 |
Age (yrs) at first menarche | ||||
<14 yrs | 67 | 63.6 | 69.7 | 0.0717 |
> = 14 or unknown | 16 | 61.2 | 68.6 | 0.4637 |
Age (yrs) at FLB | ||||
<25 yrs | 20 | 67.7 | 61.3 | 0.2268 |
> = 25 or nulliparous | 63 | 61.8 | 72.1 | 0.0022 |
Menopausal status | ||||
Pre | 43 | 51.8 | 61.9 | 0.0196 |
Post | 40 | 75.4 | 77.6 | 0.6064 |
HRT use | ||||
Never | 59 | 58.3 | 66.8 | 0.0149 |
Ever | 24 | 75.1 | 76.1 | 0.9119 |
Number of breast biopsies | ||||
0 | 61 | 56.4 | 68.7 | 0.0001 |
1+ | 22 | 81.9 | 71.7 | 0.0118 |
BMI (kg/m²) | ||||
<25 | 48 | 62.5 | 65.6 | 0.9919 |
> = 25 | 35 | 64.1 | 74.8 | 0.0014 |
First-degree female relatives with BC | ||||
0 | 26 | 45.1 | 56.8 | 0.0967 |
1+ | 57 | 71.4 | 75.2 | 0.1816 |
Second/third-degree relatives with BC | ||||
0 | 37 | 67.4 | 70.7 | 0.7617 |
1+ | 46 | 59.8 | 68.5 | 0.0185 |
Relatives with OC | ||||
0 | 61 | 65.4 | 67.5 | 0.5412 |
1+ | 22 | 57.0 | 75.1 | 0.0094 |
BRCA mutation status | ||||
Test result positive | 14 | 61.4 | 98.1 | 0.0001 |
Test result negative | 37 | 68.8 | 65.5 | 0.1457 |
Untested | 32 | 57.5 | 61.6 | 0.1823 |
Ethnicity | ||||
Non-Hispanic White | 74 | 65.2 | 72.1 | 0.0638 |
Other | 9 | 46.6 | 48.1 | 0.4961 |