Table 1.

Descriptive characteristics of participants in the AMBER consortium by study

BWHSCBCSWCHSMECAMBER
CaCoCaCoCaCoCaCoCaCo
Total, N9012,2491,40861582183453398936634687
Age, years, n (%)
 <4047 (5.2%)217 (9.6%)204 (14.5%)87 (14.1%)85 (10.4%)116 (13.9%)0 (0.0%)0 (0.0%)336 (9.2%)420 (9.0%)
 40–49262 (29.1%)652 (29.0%)459 (32.6%)211 (34.3%)215 (26.2%)228 (27.3%)9 (1.7%)16 (1.6%)945 (25.8%)1,107 (23.6%)
 50–59302 (33.5%)770 (34.2%)381 (27.1%)150 (24.4%)292 (35.6%)319 (38.2%)112 (21.0%)222 (22.4%)1,087 (29.7%)1,461 (31.2%)
 60–69204 (22.6%)442 (19.7%)267 (19.0%)114 (18.5%)173 (21.1%)142 (17.0%)175 (32.8%)288 (29.1%)819 (22.4%)986 (21.0%)
 70+86 (9.5%)168 (7.5%)97 (6.9%)53 (8.6%)56 (6.8%)29 (3.5%)237 (44.5%)463 (46.8%)476 (13.0%)713 (15.2%)
Menopausal status, n (%)
 Premenopausal310 (34.4%)834 (37.1%)526 (37.4%)234 (38.0%)363 (44.2%)394 (47.2%)0 (0.0%)0 (0.0%)1,199 (32.7%)1,462 (31.2%)
 Postmenopausal482 (53.5%)1,178 (52.4%)745 (52.9%)308 (50.1%)361 (44.0%)386 (46.3%)533 (100.0%)989 (100.0%)2,121 (57.9%)2,861 (61.0%)
 Unknown109 (12.1%)237 (10.5%)137 (9.7%)73 (11.9%)97 (11.8%)54 (6.5%)0 (0.0%)0 (0.0%)343 (9.4%)364 (7.8%)
ER status, n (%)
 ER+498 (55.3%)741 (52.6%)435 (53.0%)309 (58.0%)1,983 (54.1%)
 ER233 (25.9%)565 (40.1%)165 (20.1%)135 (25.3%)1,098 (30.0%)
 Unknown170 (18.9%)102 (7.2%)221 (26.9%)89 (16.7%)582 (15.9%)
  • Abbreviations: AMBER, African American Breast Cancer Epidemiology and Risk; BWHS, Black Women's Health Study; Ca, cases; CBCS, Carolina Breast Cancer Study; Co, controls; ER, estrogen receptor; MEC, Multi-Ethnic Cohort; WCHS, Women's Circle of Health Study.