Age at first mammogram, y
|
50-54
|
4975
|
37.18
|
120
|
36.47
|
5095
|
37.17
|
0.026
|
55-59
|
3602
|
26.92
|
110
|
33.43
|
3712
|
27.08
| |
60-64
|
4216
|
31.51
|
83
|
25.23
|
4299
|
31.36
| |
65-69
|
587
|
4.39
|
16
|
4.86
|
603
|
4.40
| |
Age at menarche, y
|
<12
|
2493
|
18.63
|
62
|
18.84
|
2555
|
18.64
|
0.990
|
12-13
|
5243
|
39.19
|
129
|
39.21
|
5372
|
39.19
| |
> = 14
|
5505
|
41.14
|
134
|
40.73
|
5639
|
41.13
| |
Unknown
|
139
|
1.04
|
4
|
1.22
|
143
|
1.04
| |
Age at first live birth, y
|
<20
|
1065
|
7.96
|
26
|
7.90
|
1091
|
7.96
|
0.050
|
20-24
|
6242
|
46.65
|
151
|
45.90
|
6393
|
46.63
| |
25-29
|
4109
|
30.71
|
91
|
27.66
|
4200
|
30.64
| |
>29
|
966
|
7.22
|
37
|
11.25
|
1003
|
7.32
| |
No children
|
902
|
6.74
|
23
|
6.99
|
925
|
6.75
| |
Unknown
|
96
|
0.72
|
1
|
0.30
|
97
|
0.71
| |
Body mass index
|
<25
|
3347
|
25.01
|
92
|
27.96
|
3439
|
25.09
|
0.569
|
25-29
|
4519
|
33.77
|
105
|
31.91
|
4624
|
33.73
| |
30-34
|
1944
|
14.53
|
53
|
16.11
|
1997
|
14.57
| |
> = 35
|
675
|
5.04
|
16
|
4.86
|
691
|
5.04
| |
Unknown
|
2895
|
21.64
|
63
|
19.15
|
2958
|
21.58
| |
Breast density (BI-RADS)(2)
|
1
|
2969
|
22.19
|
50
|
15.20
|
3019
|
22.03
|
<0.001
|
2
|
5378
|
40.19
|
102
|
31.00
|
5480
|
39.98
| |
3
|
2338
|
17.47
|
83
|
25.23
|
2421
|
17.65
| |
4
|
2067
|
15.45
|
73
|
22.19
|
2140
|
15.63
| |
Unknown
|
628
|
4.69
|
21
|
6.38
|
649
|
4.73
| |
No. of biopsies
|
0
|
13263
|
99.13
|
325
|
98.78
|
13588
|
99.12
|
0.513
|
> = 1
|
117
|
0.87
|
4
|
1.22
|
121
|
0.88
| |
Menopausal status
|
No
|
747
|
5.58
|
18
|
5.47
|
765
|
5.58
|
0.930
|
Yes
|
12633
|
94.42
|
311
|
94.53
|
12944
|
94.42
| |
Affected first-degree relatives
|
No
|
12647
|
94.52
|
302
|
91.79
|
12949
|
94.46
|
0.195
|
Yes
|
704
|
5.26
|
26
|
7.90
|
730
|
5.32
| |
Unknown
|
29
|
0.22
|
1
|
0.30
|
30
|
0.22
| |
Previous benign breast disease
|
No
|
12420
|
92.83
|
292
|
88.75
|
12712
|
92.73
|
0.005
|
|
Yes
|
960
|
7.17
|
37
|
11.25
|
997
|
7.27
| |