Table 3 Associations between selected risk factors for breast cancer andmammograms classified according to four methods
Characteristic | Upper quartile | High-risk patterns Reader NB | ||
|---|---|---|---|---|
Reader GM ≥ 28.3% | Reader GU ≥ 19.0% | Wolfe | Tabár | |
Age at screening | ||||
<60 years | 1.00 | 1.00 | 1.00 | 1.00 |
60–64 years | 0.65 | 0.74 | 0.64 | 0.79 |
65+ years | 0.52 | 0.53 | 0.59 | 0.64 |
P for trend | <0.01 | <0.01 | <0.01 | <0.03 |
Age at menarche | ||||
<13 years | 1.00 | 1.00 | 1.00 | 1.00 |
13–14 years | 1.24 | 1.28 | 1.26 | 1.36 |
14+ years | 0.90 | 1.04 | 0.81 | 0.76 |
P for trend | 0.99 | 0.50 | 0.67 | 0.70 |
Age at menopause | ||||
<48 years | 1.00 | 1.00 | 1.00 | 1.00 |
48–50 years | 0.80 | 0.85 | 0.90 | 0.87 |
51+ years | 0.95 | 1.14 | 1.38 | 1.11 |
P for trend | 0.83 | 0.47 | 0.06 | 0.61 |
Age at first birth | ||||
<20 years | 1.00 | 1.00 | 1.00 | 1.00 |
20–24 years | 0.99 | 1.15 | 1.41 | 1.14 |
25+ years | 1.30 | 1.66 | 1.67 | 1.40 |
P for trend | 0.27 | 0.07 | 0.05 | 0.15 |
Number of children | ||||
0 | 1.00 | 1.00 | 1.00 | 1.00 |
1 | 1.14 | 1.54 | 1.61 | 1.16 |
2 | 0.52 | 0.87 | 0.87 | 0.40 |
3 | 0.51 | 0.60 | 0.90 | 0.37 |
4+ | 0.18 | 0.23 | 0.41 | 0.21 |
P for trend – all | <0.0001 | <0.0001 | <0.0001 | <0.0001 |
Body mass index | ||||
<25 | 1.00 | 1.00 | 1.00 | 1.00 |
25–30 | 0.39 | 0.48 | 0.53 | 0.81 |
>30 | 0.15 | 0.19 | 0.24 | 0.36 |
P for trend | <0.0001 | <0.0001 | <0.0001 | <0.0001 |