Table 2 |
|
|
Some characteristics of 121 000 respondents in the Million Women Study |
|
| Characteristic |
Percentage |
|
|
|
| Age at screening (years) |
|
| 49 |
4.9 |
| 50-54 |
37.9 |
| 55-59 |
29.1 |
| 60-64 |
25.0 |
| 65+ |
2.3 |
| Use of hormone replacement therapy |
|
| Ever |
47.2 |
| Never |
51.4 |
| Missing |
1.4 |
| Number of children |
|
| 0 |
11.3 |
| 1 |
13.1 |
| 2 |
41.7 |
| 3 |
21.8 |
| 4 |
7.8 |
| 5 |
2.5 |
| 6+ |
1.4 |
| Missing |
0.3 |
| Age at birth of first child (years) |
|
| <20 |
12.6 |
| 20-24 |
46.0 |
| 25-29 |
29.0 |
| 30-34 |
8.0 |
| 35+ |
2.5 |
| Missing |
1.8 |
| Past use of oral contraceptives |
|
| Yes |
53.6 |
| No |
44.7 |
| Missing |
1.7 |
| Smoking history |
|
| Never |
50.3 |
| Current |
18.1 |
| Ex-smoker |
26.4 |
| Missing |
5.3 |
|
|
|
|
The Million Women Study Collaborative Group Breast Cancer Res 1999 1:73 doi:10.1186/bcr16 |
|
