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Table 2 Some characteristics of 121 000 respondents in the Million Women Study

From: The Million Women Study: design and characteristics of the study population

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