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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Mol Carcinog. 2014 Oct 22;54(12):1541–1553. doi: 10.1002/mc.22228

Table 2.

Characteristics of study population, stratified by ethnicity and case-control status, The Breast Cancer Health Disparities Study (n=7,732)

Non-Hispanic Whites (n=3,029)
Hispanics (n= 4,703)
Cases Controls Cases Controls

No. % No. % p value1 No. % No. % p value1 p value2
Total Subjects 1,430 1,599 2,093 2,610
Study Site
 4-CBCS 1,176 82.2 1,335 83.5 0.36 579 27.7 736 28.2 0.94 <0.001
 Mexico - - 816 39.0 994 38.1
 SFBCS 254 17.8 264 16.5 698 33.4 880 33.7
Age (years)
 <40 87 6.1 117 7.3 0.04 198 9.5 313 12.0 0.22 <0.001
 40–49 400 28.0 409 25.6 708 33.8 834 32.0
 50–59 403 28.2 410 25.6 614 29.3 758 29.0
 60–69 340 23.8 356 22.3 425 20.3 530 20.3
 ≥70 200 14.0 307 19.2 148 7.1 175 6.7
Percentage of Native American ancestry
 < 0.29 1,419 99.2 1,591 99.5 0.34 276 13.2 280 10.7 0.01 <0.001
 ≥ 0.29 11 0.8 8 0.5 1,817 86.8 2,330 89.3
Menopausal status
 Premenopausal 474 34.0 494 31.5 0.14 831 41.2 1,027 40.7 0.71 <0.001
 Postmenopausal 919 66.0 1,075 68.5 1,186 58.8 1,499 59.3
Body mass index (kg/m2)
 Normal (< 25) 650 46.1 699 44.4 0.35 482 23.4 453 17.6 <0.001 <0.001
 Overweight or obese (≥25) 761 53.9 877 55.7 1,580 76.6 2,123 82.4
Fat intake/1000 kcal per day Median Median p value3 Median Median p value3 p value4
 Total fat (g) 38.45 38.83 0.19 36.63 36.74 0.44 <0.001
 Polyunsaturated fat (g) 7.85 7.88 0.59 7.29 7.69 0.001 0.12
History of aspirin use5
 Yes 262 22.6 324 24.5 0.26 84 14.8 140 19.4 0.03 <0.001
 No 898 77.4 997 75.5 483 85.2 583 80.6
History of NSAIDs use5
 Yes 363 31.3 409 31.0 0.86 137 24.2 201 27.8 0.14 0.002
 No 797 68.7 912 69.0 430 78.8 522 72.2

Missing information: menopausal status n=227; body mass index n=107; total fat n=202; polyunsaturated fat n=202

1

Case-control comparison within ethnicity. p values from chi-square tests.

2

Ethnic group comparison, regardless of case-control status. p values from chi-square tests.

3

Case-control comparison within ethnicity. p values from t-tests.

4

Ethnic group comparison, regardless of case-control status. p values from t- tests.

5

Data on regular use of aspirin and NSAIDs were collected in the 4-CBCS only.