Table 1.
Characteristic | Premenopausal (n = 1369) | Postmenopausal (n = 569) |
---|---|---|
No. (%)* | No. (%)* | |
Age, y | ||
<30 | 452 (33.0) | 0 (0) |
30–39 | 410 (29.9) | 15 (2.6) |
40–49 | 395 (28.9) | 68 (12) |
50–59 | 112 (8.2) | 264 (46.4) |
60–75 | 0 (0) | 222 (39) |
Race/ethnicity | ||
Non-Hispanic Caucasian | 965 (70.5) | 414 (72.8) |
African American | 249 (18.2) | 117 (20.6) |
Asian | 25 (1.8) | 22 (3.9) |
Hispanic | 107 (7.8) | 16 (2.8) |
Other/missing | 23 (1.7) | 0 (0) |
Education | ||
High school/GED or less | 291 (21.3) | 95 (16.7) |
Vocational/tech school or associates degree | 188 (13.7) | 106 (18.6) |
College degree | 512 (37.4) | 148 (26.0) |
Graduate/professional degree | 296 (21.6) | 163 (28.6) |
Smoking | ||
Never | 1,039 (75.9) | 358 (62.9) |
Former | 217 (15.9) | 168 (29.5) |
Current | 89 (6.5) | 32 (5.6) |
Body mass index, kg/m2 | ||
<25 | 522 (38.1) | 151 (26.5) |
25–29 | 360 (26.3) | 187 (32.9) |
≥30 | 484 (35.4) | 228 (40.1) |
Age at menarche, y | ||
≤12 | 702 (51.3) | 276 (48.5) |
13 | 366 (26.7) | 154 (27.1) |
≥14 | 300 (21.9) | 138 (24.3) |
Current hormonal birth control use | ||
No | 936 (68.4) | |
Yes | 433 (31.6) | |
Parity | ||
Nulliparous | 698 (51.0) | 108 (19.0) |
Parous | 671 (49.0) | 461 (81.0) |
Number of live births | ||
1 | 183 (27.3) | 90 (19.5) |
2 | 312 (46.5) | 214 (46.4) |
≥3 | 176 (26.2) | 157 (34.1) |
Age at first full-term birth, y | ||
<25 | 269 (40.1) | 226 (49.0) |
25–29 | 215 (32.0) | 137 (29.7) |
≥30 | 185 (27.6) | 94 (20.4) |
Breastfeeding | ||
Never | 138 (20.6) | 150 (32.5) |
Ever | 533 (79.4) | 310 (67.2) |
Bilateral oophorectomy | ||
No | 440 (77.3) | |
Yes | 129 (22.7) | |
Menopausal hormone therapy | ||
Nonuser | 288 (50.6) | |
Current user | 85 (14.9) | |
Former user | 181 (31.8) | |
Years since menopause | ||
<5 | 126 (22.1) | |
5–10 | 93 (16.3) | |
11–15 | 78 (13.7) | |
>15 | 59 (10.4) | |
Gynecologic surgery | 211 (37.1) | |
Number of first degree relatives with breast cancer | ||
0 | 1,123 (82.0) | 427 (75.0) |
1 | 218 (15.9) | 108 (19.0) |
≥2 | 28 (2.0) | 34 (6.0) |
Ever had a breast biopsy | ||
Never | 1,225 (89.5) | 410 (72.1) |
Yes, 1 | 105 (7.7) | 116 (20.4) |
Yes, ≥2 | 25 (1.8) | 39 (6.9) |
H&E percent fat, % | ||
0–25 | 155 (11.3) | 18 (3.2) |
26–50 | 143 (10.4) | 36 (6.3) |
51–75 | 282 (20.6) | 88 (15.5) |
76–100 | 789 (57.6) | 427 (75.0) |
* Percentages might not total to 100 because of missingness.