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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Epidemiology. 2019 May;30(3):449–457. doi: 10.1097/EDE.0000000000000981

Table 1.

Characteristics of U.S. Hispanic and Mexican Parous Women

Cases
N=2,703		 Controls
N=3,254
N %a N %a
Study
 San Francisco Bay Area Breast Cancer Study (SFBCS) 980 36 1,357 42
 Northern California Breast Cancer Family Registry (NC-BCFR) 262 10 63 2
 4-Corners Breast Cancer Study (4-CBCS) 596 22 831 26
 Mexico Breast Cancer Study (MBCS) 865 32 1,003 31
Estrogen receptor (ER) and progesterone receptor (PR) statusb
 ER+ and/or PR+ 1,139 62
 ER-PR- 382 21
 Unknown 317 17
Age (years)
 < 40 305 11 337 10
 40–44 386 14 472 15
 45–49 464 17 537 17
 50–54 428 16 489 15
 55–59 387 14 448 14
 60–64 319 12 385 12
 ≥65 414 15 586 18
Education
 Some high school or less 1,425 53 1,963 60
 High school graduate 523 19 558 17
 Some college or higher 752 28 731 22
 Unknown 3 <1 2 <1
Family history of breast cancer in first-degree relatives
 No 2,333 86 2,925 90
 Yes 331 12 260 8
 Unknown 39 1 69 2
Age at menarche (years)
 <12 638 24 670 21
 12 679 25 732 22
 13 633 23 757 23
 ≥14 753 28 1,095 34
 Unknown 0 0
Hormonal contraceptive use
 Current 100 4 92 3
 Former 1,370 51 1,551 48
 Never 1,085 40 1,463 45
 Unknown 148 5 148 5
Menopausal status
 Premenopausal 1,073 40 1,217 37
 Postmenopausal 1,547 57 1,928 59
 Unknown 83 3 109 3
Hormone therapy use (postmenopausal women)
 Current 378 24 333 17
 Former 295 19 510 26
 Never 874 56 1,085 56
Average daily alcohol consumption (grams)c
 0 1,762 65 2,429 75
 0.1–4.9 604 22 519 16
 ≥ 5.0 303 11 279 1
 Unknown 34 1 27 1
Body mass index (kg/m2) (premenopausal women)d
 < 25.0 340 32 278 23
 25.0–29.9 401 37 470 39
 ≥ 30.0 314 29 451 37
 Unknown 18 2 18 1
Body mass index (kg/m2) (postmenopausal women)d
 < 25.0 326 21 340 18
 25.0–29.9 569 37 712 37
 ≥30.0 617 40 838 43
 Unknown 35 2 38 2
Age at first live birth (years)
 <20 755 28 1,096 34
 20–24 1,015 38 1,248 38
 25–29 557 21 614 19
 ≥30 376 14 296 9
 Mean 23.4 22.7
 Range 11–46 12–50
Paritye
 1 400 15 316 10
 2 774 29 755 23
 3 688 25 823 25
 4 374 14 492 15
 5 196 7 319 10
 ≥6 271 10 549 17
 Mean 3.0 3.6
 Range 1–12 1–17
Duration of lifetime breast-feeding (months)
 0 783 29 776 24
 1–6 922 34 964 30
 7–12 360 13 479 15
 13–24 343 13 500 15
 ≥25 295 11 535 16
 Mean 11.0 15.9
 Range 0–166 0–188

Abbreviations: 4-CBCS, 4-Corners Breast Cancer Study; ER, estrogen receptor; MBCS, Mexico Breast Cancer Study; NC-BCFR, Northern California Breast Cancer Family Registry; PR, progesterone receptor; SFBCS, San Francisco Bay Area Breast Cancer Study.

a

Percentages may not add up to 100% due to rounding.

b

Excluding participants in the MBCS for whom data on ER and PR status were not available.

c

Average daily lifetime consumption for participants in the NC-BCFR, 4-CBCS, MBCS, and SFBCS participants diagnosed/selected into the study after April 1999; and average daily consumption in reference year for SFBCS participants diagnosed/selected into the study before May 1999.

d

In reference year (calendar year before diagnosis for cases or before interview or selection into the study for controls).

e

Number of live births.