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Table 1 Study participant characteristics by breast density (Breast Cancer Surveillance Consortium, 2011)

From: Airborne metals and polycyclic aromatic hydrocarbons in relation to mammographic breast density

  Non-dense (N = 122,474; 55%) Dense (N = 100,107; 45%)
N Row % N Row %
Age
 ≤ 45 11,198 35 21,145 65
 46–50 11,716 40 17,752 60
 51–55 16,034 51 15,371 49
 56–60 22,305 59 15,606 41
 61–65 21,832 64 12,540 36
 66–69 15,864 67 7794 33
 ≥ 70 23,525 70 9899 30
Race
 White 87,482 57 67,257 43
 Black 13,720 62 8365 38
 Asian, native Hawaiian or Pacific Islander 9846 37 16,612 63
 Other 2847 56 2256 44
 Hispanic 8579 60 5617 40
Body mass index
 < 18.5 535 21 2042 79
 18.5–24.9 kg/m2 23,987 38 39,821 62
 25–29.9 kg/m2 24,678 62 15,195 38
 ≥ 30 kg/m2 27,607 79 7383 21
 Missing 45,667 56 35,666 44
Ever given birth
 No 23,636 48 25,165 52
 Yes 98,838 57 74,942 43
Hormone therapy use
 No 106,627 55 88,228 45
 Yes 5873 51 5614 49
 Missing 9974 61 6265 39
Menopausal status
 Premenopausal 26,167 38 42,779 62
 Postmenopausal 96,307 63 57,328 37
Zip code level median income
 < $50,000 40,119 62 24,347 38
 $50,000–$99,999 74,132 53 65,067 47
 ≥ $100,000 8223 43 10,693 57
Zip code level college education
 Quartile 1 27,836 61 17,815 39
 Quartile 2 33,424 58 24,535 42
 Quartile 3 27,621 54 23,729 46
 Quartile 4 33,593 50 34,028 50
BI-RADS
 1 28,617 100 0 0
 2 93,857 100 0 0
 3 0 0 80,462 100
 4 0 0 19,645 100