Table 1 Characteristics of women volunteers who donated normal breast tissue to the US-based Susan G. Komen Tissue Bank that were included in the current study (N = 4108)
Characteristic | Overall, N (%) |
|---|---|
Age, years | |
< 30 | 819 (20.0) |
30–39 | 822 (20.0) |
40–49 | 909 (22.1) |
50–59 | 913 (22.2) |
60–75 | 645 (15.7) |
Race/ethnicity | |
Non-Hispanic White | 2953 (71.9) |
Non-Hispanic Black/African American | 756 (18.4) |
Asian/other | 381 (9.3) |
Education | |
High school/GED or less | 687 (16.7) |
Vocation/tech school or associates degree | 694 (16.9) |
College degree | 1331 (32.4) |
Graduate/professional degree | 1037 (25.2) |
Other | 338 (8.2) |
Smoking | |
Never | 2780 (67.7) |
Former | 842 (20.5) |
Current | 137 (3.3) |
Currently drink alcohol | |
No | 1372 (33.4) |
Yes | 2699 (65.7) |
Alcoholic drinks per week | |
< 1 | 284 (6.9) |
1–6 | 1976 (48.1) |
≥ 7 | 252 (6.1) |
Body mass index, kg/m2 | |
< 25 | 1294 (31.5) |
25–29 | 1102 (26.8) |
≥ 30 | 1708 (41.6) |
Age at menarche, years | |
≤ 12 | 2180 (53.1) |
13 | 1098 (26.7) |
≥ 14 | 826 (20.1) |
Current hormonal birth control usea | |
No | 2255 (83.6) |
Yes | 441 (16.4) |
Pregnancy | |
Nulligravid | 1258 (30.6) |
Gravid | 2849 (69.4) |
Number of live births | |
0 | 197 (6.9) |
1 | 582 (20.4) |
2 | 1184 (41.6) |
≥ 3 | 719 (25.2) |
Age at first full-term birth, years | |
< 25 | 645 (22.6) |
25–29 | 428 (15.0) |
≥ 30 | 356 (12.5) |
Breastfeeding | |
Never | 810 (28.4) |
Ever | 1818 (63.8) |
Duration of breastfeeding, months | |
Never | 810 (28.4) |
< 12 | 971 (34.1) |
≥ 12– < 24 | 484 (17.0) |
≥ 24 | 359 (12.6) |
Bilateral oophorectomyb | |
No | 752 (53.2) |
Yes | 295 (20.9) |
Menopausal status | |
Premenopausal | 2696 (65.6) |
Postmenopausal | 1412 (34.4) |
Menopausal hormone therapy usec | |
Nonuser | 779 (55.2) |
Current user | 217 (15.4) |
Former user | 115 (8.1) |
Type of current menopausal hormone therapy | |
Estrogen only | 79 (36.4) |
Progesterone only | 0 (0.0) |
Combined estrogen and progesterone | 87 (40.1) |
Type of former menopausal hormone therapy | |
Estrogen only | 54 (46.9) |
Progesterone only | 0 (0.0) |
Combined estrogen and progesterone | 38 (33.0) |
Family history of breast cancer | |
Negative | 3006 (73.2) |
Positive | 8.7 (20.4) |