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Table 1 Characteristics of women by breast density category, and odds ratios for association with denser breast category (n = 157)

From: Dietary intake and breast density in high-risk women: a cross-sectional study

Characteristic

Entirely fatty (n = 20)

Heterogeneously dense (n = 44)

Scattered fibroglandular tissue (n = 54)

Extremely dense (n = 39)

Age-adjusted odds ratio (95% confidence interval)a

Age (years)

54.1 ± 1.0

53.9 ± 0.9

48.7 ± 0.6

47.4 ± 0.7

0.4 (0.3–0.6)b

College graduate (%)c

55

72

72

84

1.5 (0.8–3.0)

Body mass index (kg/m2)

33.3 ± 7.1

28.3 ± 6.1

24.8 ± 4.4

23.8 ± 3.0

0.8 (0.8–0.9)

Age at menarche (years)

12.4 ± 1.3

12.3 ± 1.3

12.5 ± 1.4

13.1 ± 1.8

1.3 (1.1–1.6)

Number of live birthsc

3.1 ± 1.4

2.5 ± 1.6

2.6 ± 0.9

1.9 ± 1.0

0.8 (0.6–1.0)

Age at first birth (years)c

23.7 ± 5.9

25.6 ± 4.1

27.4 ± 5.8

29.5 ± 5.1

1.1 (1.0–1.2)

Ever breastfedc

30

72

63

75

1.0 (0.4–2.7)

Postmenopausal

65

66

33

28

0.5 (0.3–1.2)

Ever used hormonal contraceptives

45

41

63

37

0.8 (0.5–1.4)

Ever used hormone replacement medicined

85

45

56

36

0.4 (0.2–1.0)

Weekly physical activity (hours)

2.9 ± 2.9

3.6 ± 3.0

3.5 ± 2.9

2.9 ± 2.5

1.0 (0.8–1.1)

Smoking status

     

   ∘ Never smoked

50

49

57

61

1.0

   ∘ Former smoker

45

49

39

26

0.6 (0.3–1.1)

   ∘ Current smoker

5

2

4

13

2.0 (0.5–7.6)

Family history of breast cancer

     

   ∘ Negative or sporadic

15

30

22

10

1.0

   ∘ Familial

35

45

33

33

1.3 (0.6–2.9)

   ∘ Hereditary

50

25

44

56

1.8 (0.8–4.0)

  1. Characteristics data presented as the mean ± standard deviation or as the percentage. aOdds ratios adjusted for age except for the age variable. bOdds ratio for 10-year age increment. c Because of missing responses, analyses included only 155 women for education level, 125 women for number of live births, 120 parous women for age at first live birth, and 74 parous women for breastfeeding. dAnalysis conducted among 70 postmenopausal women.