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Table 3 Quartiles of air toxics and breast density (Breast Cancer Surveillance Consortium, 2011)

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

Air toxics Non-dense breasts Dense breasts Age-adjusted OR (95% CI) Adjusted OR (95% CI)1
Arsenic
 Quartile 1 31,220 26,086 1.00 (reference) 1.00 (reference)
 Quartile 2 32,046 20,194 0.76 (0.74, 0.78) 0.79 (0.77, 0.81)
 Quartile 3 27,568 26,764 1.16 (1.13, 1.19) 1.25 (1.21, 1.28)
 Quartile 4 31,640 27,063 1.05 (1.02, 1.07) 1.20 (1.17, 1.23)
Cadmium
 Quartile 1 33,843 24,279 1.00 (reference) 1.00 (reference)
 Quartile 2 28,330 22,972 1.07 (1.05, 1.10) 0.94 (0.92, 0.97)
 Quartile 3 27,637 25,674 1.23 (1.20, 1.26) 1.00 (0.98, 1.03)
 Quartile 4 32,664 27,182 1.11 (1.08, 1.14) 0.92 (0.90, 0.95)
Chromium
 Quartile 1 37,475 26,042 1.00 (reference) 1.00 (reference)
 Quartile 2 28,046 21,201 1.07 (1.04, 1.10) 1.05 (1.02, 1.08)
 Quartile 3 28,691 28,069 1.38 (1.35, 1.42) 1.21 (1.18, 1.24)
 Quartile 4 28,262 24,795 1.21 (1.18, 1.24) 0.96 (0.93, 0.99)
Cobalt
 Quartile 1 36,555 20,137 1.00 (reference) 1.00 (reference)
 Quartile 2 26,648 22,128 1.43 (1.39, 1.46) 1.18 (1.14, 1.21)
 Quartile 3 28,415 27,756 1.73 (1.69, 1.77) 1.44 (1.40, 1.48)
 Quartile 4 30,856 30,086 1.76 (1.72, 1.80) 1.60 (1.56, 1.64)
Lead
 Quartile 1 35,577 22,375 1.00 (reference) 1.00 (reference)
 Quartile 2 29,904 24,019 1.27 (1.24, 1.30) 1.05 (1.03, 1.08)
 Quartile 3 28,099 27,188 1.49 (1.46, 1.53) 1.30 (1.26, 1.33)
 Quartile 4 28,894 26,525 1.46 (1.42, 1.50) 1.56 (1.52, 1.60)
Manganese
 Quartile 1 32,270 28,150 1.00 (reference) 1.00 (reference)
 Quartile 2 32,420 22,723 0.78 (0.77, 0.80) 0.75 (0.73, 0.76)
 Quartile 3 28,245 22,616 0.88 (0.86, 0.90) 0.78 (0.76, 0.80)
 Quartile 4 29,539 26,618 1.02 (1.00, 1.05) 1.18 (1.15, 1.21)
Mercury
 Quartile 1 31,815 23,075 1.00 (reference) 1.00 (reference)
 Quartile 2 29,247 25,376 1.20 (1.17, 1.23) 1.15 (1.12, 1.18)
 Quartile 3 28,935 26,272 1.25 (1.22, 1.28) 1.13 (1.10, 1.16)
 Quartile 4 32,477 25,384 1.08 (1.06, 1.11) 0.95 (0.92, 0.97)
Nickel
 Quartile 1 32,602 18,301 1.00 (reference) 1.00 (reference)
 Quartile 2 28,815 25,789 1.54 (1.50, 1.58) 1.38 (1.34, 1.42)
 Quartile 3 28,615 27,034 1.66 (1.62, 1.70) 1.47 (1.43, 1.51)
 Quartile 4 32,442 28,983 1.54 (1.51, 1.58) 1.23 (1.20, 1.26)
Selenium
 Quartile 1 32,620 22,413 1.00 (reference) 1.00 (reference)
 Quartile 2 31,727 25,451 1.11 (1.09, 1.14) 1.00 (0.97, 1.03)
 Quartile 3 26,406 24,893 1.29 (1.26, 1.32) 1.03 (1.00, 1.06)
 Quartile 4 31,721 27,350 1.20 (1.17, 1.23) 0.90 (0.88, 0.93)
PAHs
 Quartile 1 34,931 18,570 1.00 (reference) 1.00 (reference)
 Quartile 2 29,218 24,831 1.60 (1.56, 1.64) 1.60 (1.56, 1.65)
 Quartile 3 29,325 29,141 1.90 (1.85, 1.94) 1.66 (1.62, 1.71)
 Quartile 4 29,000 27,565 1.76 (1.72, 1.81) 1.27 (1.23, 1.31)
  1. 1Adjusted for age, race, menopausal status, zip code level income and education, and parity status