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Table 1.

Characteristics of women according to whether they had ≤30% or ≥70% of the breast showing mammographic densities

Mammographic densities*
≤30% (n = 287)≥70% (n = 256)
Age, y (mean ± SD) 51.4 ± 5.7 46.1 ± 4.5 
Body mass index, kg/m2 (mean ± SD) 28.9 ± 6.0 23.3 ± 3.1 
Age at menarche, y (mean ± SD) 12.5 ± 1.6 12.7 ± 1.5 
Parity (mean ± SD) 3.0 ± 1.7 2.1 ± 1.4 
Age at first birth, y (mean ± SD) 23.2 ± 3.9 24.7 ± 4.8 
Oral contraceptive use (%) 55.4 70.1 
Menopausal status (%)   
    Premenopausal 31.4 75.3 
    Perimenopausal 7.0 4.7 
    Postmenopausal 61.7 20.0 
Hormone replacement therapy use (%) 41.3 49.0 
Family history of breast cancer§ (%) 23.2 32.0 
Age when leaving full time school, y (mean ± SD) 18.3 ± 2.3 19.3 ± 2.7 
Daily average alcohol intake, drinks (mean ± SD) 0.30 ± 0.57 0.55 ± 0.89 
Daily average caloric intake, kcal (mean ± SD) 1,964 ± 730 1,994 ± 760 
Smoking status (%)   
    Nonsmoker 43.6 45.7 
    Former smoker 37.3 27.7 
    Current smoker 19.2 26.6 
Mammographic densities*
≤30% (n = 287)≥70% (n = 256)
Age, y (mean ± SD) 51.4 ± 5.7 46.1 ± 4.5 
Body mass index, kg/m2 (mean ± SD) 28.9 ± 6.0 23.3 ± 3.1 
Age at menarche, y (mean ± SD) 12.5 ± 1.6 12.7 ± 1.5 
Parity (mean ± SD) 3.0 ± 1.7 2.1 ± 1.4 
Age at first birth, y (mean ± SD) 23.2 ± 3.9 24.7 ± 4.8 
Oral contraceptive use (%) 55.4 70.1 
Menopausal status (%)   
    Premenopausal 31.4 75.3 
    Perimenopausal 7.0 4.7 
    Postmenopausal 61.7 20.0 
Hormone replacement therapy use (%) 41.3 49.0 
Family history of breast cancer§ (%) 23.2 32.0 
Age when leaving full time school, y (mean ± SD) 18.3 ± 2.3 19.3 ± 2.7 
Daily average alcohol intake, drinks (mean ± SD) 0.30 ± 0.57 0.55 ± 0.89 
Daily average caloric intake, kcal (mean ± SD) 1,964 ± 730 1,994 ± 760 
Smoking status (%)   
    Nonsmoker 43.6 45.7 
    Former smoker 37.3 27.7 
    Current smoker 19.2 26.6 
*

Percentage of the breast showing mammographic densities.

In parous women.

In postmenopausal women.

§

Mother, sister, daughter, maternal or paternal grandmother, or aunt.

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