Table 2 Breast cancer risk factors by estrogen receptor status.
Estrogen receptor positive | Estrogen receptor negative | |||
|---|---|---|---|---|
Factor | Adjusted OR (95% CI)a | p trendb | Adjusted OR (95% CI) | p trendb |
Weight (kg) by quartile | ||||
<58 | 1.0 ref.c | 1.0 | ||
58-64 | 0.7 (0.5-1.5) | 1.3 (0.5-3.6) | ||
65-71 | 1.1 (0.7-1.8) | 1.9 (0.7-4.9) | ||
>71 | 1.2 (0.7-1.9) | >0.20 | 2.1 (0.8-5.9) | 0.10 |
Number of full term pregnancies | ||||
0 | 1.0 | 1.0 | ||
1 | 1.0 (0.6-1.6) | 1.7 (0.6-5.1) | ||
>1 | 0.6 (0.4-0.9) | 0.01 | 1.2 (0.5-3.1) | >0.20 |
Hormone replacement-therapy | ||||
Never | 1.0 | 1.0 | ||
Ever | 1.1 (0.7-1.7) | 1.8 (0.8-4.1) | ||