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Table 1 Characteristics of DISC participants in childhood and as young adults

From: Pubertal timing and breast density in young women: a prospective cohort study

 

Number

Mean

SD

Percentage

Child characteristics

 Race/ethnicity

  White

164

  

90

  Other

18

  

10

 Age at baseline, years

182

9.13

0.59

 

 BMI z-score at baseline

182

0.23

0.90

 

 Age at thelarche, years

170

10.59

1.09

 

 Age at pubarche, years

173

10.97

1.19

 

 Age at menarche, years

182

12.90

1.26

 

Adult characteristics

 Age at follow-up, years

182

27.17

1.02

 

 BMI, kg/m2

182

25.39

5.36

 

 DXA % body fat, %

176

35.41

8.82

 

 Exogenous hormone use

  Never

11

  

6

  Former

66

  

36

  Current

105

  

58

 Duration of hormone use, years

171

5.6

3.5

 

 Parous (vs nulliparous)

53/182

  

29

 Education

    

  Graduate degree

25

  

14

  Bachelor’s degree

95

  

52

  Some college or less

62

  

34

 Ever smokers (vs never-smokers)

82/182

  

45

 Breast density measures

  Percent dense breast volume (%)

182

27.6

20.5

 

  Absolute dense breast volume (cm3)

182

104.2

70.6

 

  Absolute non-dense breast volume (cm3)

182

413.3

364.3

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