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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