|
Light activity
|
Total
|
Ages 35-39 years
|
Past 10 years
|
|---|
| | |
Never/Rarely
|
<1 hr/wk
|
1-3 hrs/wk
|
4-7 hrs/wk
|
>7 hrs/wk
|
Never/Rarely
|
<1 hr/wk
|
1-3 hrs/wk
|
4-7 hrs/wk
|
>7 hrs/wk
|
|---|
|
Participants, No. (%)
|
118899
|
5189 (4)
|
6121 (5)
|
20710 (17)
|
29018 (24)
|
55602 (47)
|
5789 (5)
|
6811 (6)
|
24450 (21)
|
32432 (27)
|
47827 (40)
|
|
Age at baseline (yrs)
|
62.9
|
62.6
|
62.2
|
62.4
|
62.6
|
63.3
|
62.5
|
62.3
|
62.4
|
62.9
|
63.2
|
|
BMI, current* (kg/m2)
|
26.7
|
27.0
|
27.3
|
26.8
|
26.7
|
26.6
|
28.6
|
28.4
|
27.4
|
26.6
|
26.0
|
|
BMI at age 18* (kg/m2)
|
20.9
|
21.1
|
21.1
|
21.0
|
20.9
|
20.8
|
21.3
|
21.1
|
21.0
|
20.8
|
20.8
|
|
Caucasian (%)
|
91.2
|
85.3
|
85.8
|
89.5
|
91.8
|
93.1
|
84.9
|
85.0
|
90.0
|
92.3
|
93.1
|
|
College education (%)
|
31.5
|
31.8
|
33.6
|
35.0
|
34.3
|
28.9
|
27.5
|
29.8
|
34.0
|
33.8
|
29.6
|
|
Family history of breast cancer† (%)
|
13.7
|
13.1
|
13.8
|
13.4
|
13.5
|
13.9
|
13.6
|
13.3
|
13.4
|
13.6
|
13.8
|
|
Current smoker (%)
|
13.4
|
12.6
|
12.8
|
13.3
|
13.1
|
13.7
|
16.7
|
15.1
|
13.7
|
12.9
|
12.9
|
|
Ever MHT use‡ (%)
|
61.7
|
59.0
|
58.7
|
61.6
|
62.5
|
62.1
|
56.9
|
58.3
|
61.8
|
62.8
|
62.0
|
|
Age at menarche (yrs)
|
12.50
|
12.51
|
12.48
|
12.48
|
12.48
|
12.51
|
12.48
|
12.47
|
12.47
|
12.48
|
12.53
|
|
Age at first birth (yrs)
|
22.98
|
22.98
|
23.33
|
23.30
|
23.23
|
22.73
|
22.75
|
23.04
|
23.20
|
23.14
|
22.81
|
|
Parity (no. of children)
|
2.01
|
1.87
|
1.79
|
1.77
|
1.90
|
2.19
|
1.92
|
1.88
|
1.89
|
1.98
|
2.11
|
|
Age at menopause(yrs)
|
47.02
|
47.01
|
47.31
|
47.32
|
47.34
|
47.24
|
46.59
|
47.00
|
47.20
|
47.43
|
47.34
|
|
Alcohol intake (g/d)
|
6.2
|
6.0
|
6.1
|
6.3
|
6.4
|
6.1
|
6.1
|
5.5
|
6.1
|
6.3
|
6.2
|
|
Moderate-to-vigorous activity
| |
Ages 35-39 years
|
Past 10 years
|
| | |
Never/Rarely
|
<1 hr/wk
|
1-3 hrs/wk
|
4-7 hrs/wk
|
>7 hrs/wk
|
Never/Rarely
|
<1 hr/wk
|
1-3 hrs/wk
|
4-7 hrs/wk
|
>7 hrs/wk
|
|
Participants, No. (%)
|
118899
|
10868 (9)
|
10507 (9)
|
26715 (23)
|
31560 (27)
|
37477 (32)
|
17028 (14)
|
12498 (11)
|
29927 (25)
|
30231 (25)
|
28214 (24)
|
|
Age at baseline (yrs)
|
62.9
|
62.8
|
62.5
|
62.5
|
62.7
|
63.4
|
62.9
|
62.5
|
62.7
|
62.9
|
63.1
|
|
BMI, current* (kg/m2)
|
26.7
|
27.6
|
27.3
|
26.8
|
26.5
|
26.4
|
28.7
|
28.0
|
26.9
|
26.0
|
25.4
|
|
BMI at age 18* (kg/m2)
|
20.9
|
21.3
|
21.0
|
20.9
|
20.8
|
20.7
|
21.2
|
21.0
|
20.8
|
20.8
|
20.7
|
|
Caucasian (%)
|
91.2
|
88.0
|
89.1
|
90.9
|
92.6
|
92.6
|
88.7
|
89.7
|
91.4
|
92.7
|
92.4
|
|
College education (%)
|
31.5
|
33.2
|
35.8
|
35.7
|
33.0
|
26.4
|
30.3
|
31.8
|
33.7
|
33.7
|
27.9
|
|
Family history of breast cancer† (%)
|
13.7
|
13.0
|
13.4
|
13.7
|
13.6
|
14.0
|
13.3
|
13.9
|
13.4
|
14.1
|
13.6
|
|
Current smoker (%)
|
13.4
|
12.0
|
12.3
|
12.5
|
13.3
|
14.8
|
15.5
|
14.3
|
13.6
|
12.6
|
12.5
|
|
Ever MHT use‡ (%)
|
61.7
|
56.7
|
60.1
|
63.0
|
63.3
|
61.8
|
57.8
|
60.8
|
62.1
|
64.1
|
61.6
|
|
Age at menarche (yrs)
|
12.50
|
12.38
|
12.48
|
12.48
|
12.49
|
12.55
|
12.40
|
12.46
|
12.48
|
12.52
|
12.56
|
|
Age at first birth (yrs)
|
22.98
|
23.39
|
23.40
|
23.25
|
23.02
|
22.60
|
23.06
|
23.06
|
23.07
|
23.06
|
22.76
|
|
Parity (no. of children)
|
2.01
|
1.74
|
1.81
|
1.89
|
2.02
|
2.22
|
1.88
|
1.95
|
1.99
|
2.04
|
2.09
|
|
Age at menopause(yrs)
|
47.02
|
47.39
|
47.42
|
47.42
|
47.33
|
47.05
|
46.94
|
47.17
|
47.34
|
47.40
|
47.26
|
|
Alcohol intake (g/d)
|
6.2
|
5.7
|
5.9
|
6.3
|
6.5
|
6.2
|
5.8
|
5.8
|
6.1
|
6.4
|
6.5
|
- *BMI: body mass index.
- †Family history of breast cancer in a first-degree female relative.
- ‡MHT: menopausal hormone therapy.
