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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Mutat Res. 2014 Dec 1;770:19–28. doi: 10.1016/j.mrfmmm.2014.08.009

Table 1.

Description of study population by self-reported race/ethnicity

U.S. non-Hispanic White U. S. Hispanic/Native American or Mexican
Controls Cases Controls Cases
N % N % N % N %
Total 1585 37.9 1481 41.2 2597 62.1 2111 58.8
Study
 4-CBCS 1321 83.3 1227 82.8 723 27.8 597 28.3
 MBCS 0 0 0 0 994 38.3 816 38.7
 SFBCS 264 16.7 254 17.2 880 33.9 698 33.1
Age (years)
 <40 116 7.3 89 6 311 12 200 9.5
 40–49 408 25.7 409 27.6 831 32 713 33.8
 50–59 409 25.8 413 27.9 756 29.1 617 29.2
 60–69 349 22 361 24.4 526 20.3 430 20.4
 >70 303 19.1 209 14.1 173 6.7 151 7.2
 Mean 56.6 56 52.3 52.7
Menopausal Status
 Pre-menopausal 494 31.5 489 33.5 1027 40.7 836 40.9
 Post-menopausal 1075 68.5 970 66.5 1499 59.3 1210 59.1
Estimated Percent Native American Ancestry
 0–28 1577 99.5 1472 99.4 278 10.7 275 13
 29–70 7 0.4 7 0.5 1686 64.9 1393 66
 71–100 1 0.1 2 0.1 633 24.4 443 21
ER/PR Status2
 ER+/PR+ NA1 695 68.2 NA1 605 61.9
 ER+/PR- NA1 121 11.9 NA1 115 11.8
 ER−/PR+ NA1 15 1.5 NA1 28 2.9
 ER−/PR− NA1 188 18.4 NA1 229 23.4
Vital Status2,3
 Deceased NA1 255 21.4 NA1 229 19.8
 Alive NA1 935 78.6 NA1 929 80.2
Cause of Death2,3
 Breast Cancer NA1 121 47.5 NA1 128 55.9
 Other NA1 134 52.5 NA1 101 44.1
SEER Summary Stage2,3
 Local NA1 831 71 NA1 650 59.6
 Regional NA1 325 27.8 NA1 432 39.6
 Distant NA1 15 1.3 NA1 9 0.8
Smoking Status4
 Never 794 60.3 688 56.1 1616 72.1 1298 70.1
 Former 360 27.3 386 31.5 347 15.5 322 17.4
 Current 163 12.4 152 12.4 278 12.4 231 12.5
BMI (kg/m2)
 <25 699 44.4 678 45.9 453 17.6 492 23.5
 25–29.9 465 29.5 433 29.3 951 36.9 768 36.7
 ≥30 412 26.1 367 24.8 1172 45.5 832 39.8
NSAID use5
 No 708 53.7 670 54.7 446 61.7 395 66.2
 Yes 610 46.3 554 45.3 277 38.3 202 33.8
Dietary Oxidative Balance Score6 [mean (SD)]
 4-CBCS 6.3 (2.7) 6.3 (2.6) 6.7 (2.5) 6.5 (2.6)
 MBCS NA1 NA1 5.9 (2.0) 5.7 (2.0)
 SFBCS 5.6 (2.6) 5.7 (2.6) 6.9 (2.5) 6.1 (2.5)
1

Data not applicable (NA)

2

Data unavailable from Mexico Breast Cancer Study (MBCS).

3

Includes first primary invasive breast cancer cases from the 4-Corners Breast Cancer Study (4-CBCS) and San Francisco Bay Area Breast Cancer Study (SFBCS) only

4

Data available for a subset of SFBCS participants only

5

Data only available for the 4-CBCS

6

Dietary Oxidative Balance Score (DOBS) includes alcohol (pro-oxidant), vitamin C, vitamin E, beta carotene (data not available for MBCS), folic acid, and dietary fiber (anti-oxidants).