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Table 1 Characteristics of the 1,904 US-based women with TDLU information from the Komen Tissue Bank

From: Outdoor air pollution and terminal duct lobular involution of the normal breast

  Overall (n = 1,904)a Premenopausal (n = 1,322) Postmenopausal (n = 574)
N % N % N %
Age (years) at donation (mean, SD) 41.5 13.8 34.9 10.0 56.9 8.2
Race/ethnicity
 Non-Hispanic white 1,370 72 946 72 420 73
 Non-Hispanic Black 355 19 235 18 120 21
 Asian 29 2 22 2 7 1
 Hispanic 134 7 107 8 23 4
 Other 16 1 12 1 4 1
Highest level of education
 Less than high school or high school graduate 383 20 278 21 103 18
 Vocational or technical school or associate’s 288 15 175 13 110 19
 College degree 653 34 503 38 147 26
 Graduate or professional degree 456 24 289 22 167 29
 Other 124 7 77 6 47 8
Cigarette smoking status
 Never 1,388 73 1,012 76 370 65
 Past 388 20 216 16 170 30
 Current 128 7 94 7 34 6
Percent of fat on the slide
 0–25% 170 9 150 11 18 3
 26–50% 178 9 142 11 35 6
 51–75% 366 19 281 21 84 15
 76–100% 1,190 63 749 57 437 76
BMI
 < 25.0 666 35 521 39 144 25
 25.0 to < 30.0 530 28 338 26 189 33
 ≥ 30.0 708 37 463 35 241 42
Year of tissue donation
 2009 322 16 247 19 69 12
 2010 331 17 236 18 93 16
 2011 451 24 315 24 136 24
 2012 800 42 524 40 276 48
TDLU count (mean, SD) 7.3 10.3 8.4 11.1 4.5 7.3
TDLU span (mean, SD)b 349.7 164.5 374.1 165.9 280.2 137.7
Category of acini/TDLU (mean, SD)b 1.6 0.8 1.8 0.9 1.3 0.6
  1. Percentages may not sum to 100% due to rounding
  2. aEight were missing menopausal status, but were included in the overall population
  3. bAmong the 1,262 women (926 premenopausal, 330 postmenopausal) with a TDLU count > 0