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Table 5 Comparison of those who did and did not give sufficient information and/or permission for follow up

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

 

Sufficient information and/or permission for follow-up

Characteristic

Yes (n = 113 104)

No (n = 8025)

Average age (years)

56.1

56.2

Average age at leaving school (years)

15

15

Average height (m)

1.62

1.62

Average weight (kg)

68.5

67.5

Current smoker (%)

18

18

Drink alcohol (%)

78

72

Exercise at least once a week (%)

43

42

Parous (%)

89

84

Average number of children

2.4

2.4

Average age at first birth (years)

24.0

24.3

Previous breast cancer screen (%)

79

76

Previous diagnosis of breast cancer (%)

1.4

0.9

Mother or sister with a history of breast

9

8

cancer (%)

  

Previous use of oral contraceptives (%)

54

45

Current use of HRT (%)

33

25

Past use of HRT (%)

15

14

  1. HRT, hormone replacement therapy.