From: The Million Women Study: design and characteristics of the study population
Characteristic | Percentage |
---|---|
Age at screening (years) | Â |
   49 | 4.9 |
   50-54 | 37.9 |
   55-59 | 29.1 |
   60-64 | 25.0 |
   65+ | 2.3 |
Use of hormone replacement therapy | Â |
   Ever | 47.2 |
   Never | 51.4 |
   Missing | 1.4 |
Number of children | Â |
   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) | Â |
   <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 | Â |
   Yes | 53.6 |
   No | 44.7 |
   Missing | 1.7 |
Smoking history | Â |
   Never | 50.3 |
   Current | 18.1 |
   Ex-smoker | 26.4 |
   Missing | 5.3 |