Table 1 Characteristics of participants in the International Consortium on Mammographic Density
World Regiona: | All women (n = 10,681) | White (n = 4512) | Black (n = 938) | East Asian (n = 1837) | South Asian (n = 1133) | Mestizo (n = 333) | Hawaiian (n = 142) | Middle Eastern (n = 1786) |
|---|---|---|---|---|---|---|---|---|
n [column %] unless stated otherwise | ||||||||
Per cent density (cm2) | ||||||||
Median (IQR) | 20 (11–31) | 22 (16–35) | 17 (10–26) | 24 (16–35) | 16 (8–25) | 20 (13–27) | 18 (9–32) | 16 (8–24) |
Dense area (cm2) | ||||||||
Median (IQR) | 27 (16–41) | 27 (17–42) | 34 (20–49) | 24 (15–35) | 22 (12–35) | 28 (18–42) | 25 (12–38) | 29 (16–43) |
Age at mammogram (years) | ||||||||
Mean (SD) | 52.7 (8.2) | 53.8 (7.7) | 52.4 (8.5) | 52.1(8.5) | 53.6 (7.2) | 44.2 (6.4) | 55.1 (7.5) | 51.4 (8.5) |
IQR | 47–58 | 49–59 | 46–58 | 45–58 | 49–59 | 40–49 | 50–61 | 45–57 |
Age at menarche (yrs)b | ||||||||
< 12.0 | 1470 [14] | 838 [19] | 80 [9] | 166 [9] | 153 [14] | 77 [23] | 20 [14] | 136 [8] |
12.0–12.9 | 2588 [24] | 1031 [23] | 116 [12] | 437 [24] | 300 [26] | 87 [26] | 56 [39] | 561 [31] |
13.0–13.9 | 2594 [24] | 1185 [26] | 167 [18] | 350 [19] | 283 [25] | 73 [22] | 0 [0] | 536 [30) |
14.0–14.9 | 2023 [19] | 848 [19] | 182 [19] | 425 [23] | 165 [15] | 46 [14] | 47 [33] | 310 [17] |
≥ 15.0 | 2006 [19] | 610 [14] | 393 [42] | 459 [25] | 232 [20] | 50 [15] | 19 [13] | 243 [14] |
Mean age (SD) | 13.2 (1.7) | 12.9 (1.6) | 14.2 (2.1) | 13.5 (1.8) | 13.2 (1.7) | 12.7 (1.7) | 12.9 (1.8) | 13.0 (1.4) |
Height (cm) | ||||||||
< 155 | 2760 [26] | 685 [15] | 186 [20] | 704 [38] | 663 [59] | 113 [34] | 17 [12] | 392 [22] |
155–159.9 | 2609 [24] | 905 [20] | 211 [22] | 604 [33] | 268 [24] | 125 [38] | 15 [11] | 481 [27] |
160–164.9 | 2759 [26] | 1299 [29] | 287 [31] | 395 [22] | 136 [12] | 70 [21] | 42 [30] | 530 [30] |
> 165 | 2553 [24] | 1623 [36] | 254 [27] | 134 [7] | 66 [6] | 25 [8] | 68 [48] | 383 [21] |
Mean height (SD) | 159.4 (7.2) | 162.0 (6.9) | 160.6 (7.6) | 156.4 (5.6) | 153.2 (6.8) | 157.0 (5.3) | 163.2 (6.0) | 159.4 (6.3) |
% of measured heightsc | 66 | 57 | 39 | 57 | 85 | 98 | 0 | 100 |
BMI | ||||||||
≤ 20.0 | 642 (6) | 208 (5) | 9 (1) | 284 (15) | 95 (8) | 3 (1) | 2 (1) | 41 (2) |
20.1–25.0 | 3920 (37) | 1787 (40) | 171 (18) | 1086 (59) | 376 (33) | 82 (25) | 43 (30) | 375 (21) |
25.1–30.0 | 2342 (32) | 1503 (33) | 320 (34) | 411 (22) | 428 (38) | 133 (40) | 45 (32) | 592 (33) |
> 30.0 | 2687 (25) | 1014 (22) | 438 (47) | 56 (3) | 234 (21) | 115 (35) | 52 (37) | 778 (44) |
Mean BMI (SD) | 27.0 (5.7) | 26.7 (5.3) | 30.3 (6.2) | 23.2 (3.4) | 26.3 (5.0) | 28.7 (5.1) | 28.9 (6.3) | 29.6 (6.0) |
Menopausal status | ||||||||
Pre-menopausal | 4361 [41] | 1761 [39] | 328 [35] | 799 [43] | 324 [29] | 261 [78] | 35 [25] | 853 [48] |
Post-menopausal | 6320 [59] | 2751 [61] | 610 [65] | 1038 [57] | 809 [71] | 72 [22] | 107 [75] | 933 [52] |
Ever used hormone therapyd | ||||||||
Yes | 2185 [25] | 1387 [36] | 133 [14] | 384 [21] | 82 [8] | 27 [8] | 78 [55] | 94 [12] |
No | 6681 [75] | 2456 [64] | 802 [86] | 1425 [79] | 969 [92] | 291 [92] | 64 [45] | 674 [88] |
Parity | ||||||||
Nulliparous | 1068 [10] | 661 [15] | 61 [7] | 161 [9] | 90 [8] | 21 [6] | 9 [6] | 65 [4] |
Parous | 9613 [90] | 3851 [85] | 877 [94] | 1,676 [91] | 1,043 [92] | 312 [94] | 133 [94] | 1721 [96] |
Mean parity (SD) | 2.6 (1.8) | 2.4 (1.1) | 3.3 (1.7) | 2.5 (1.2) | 3.9 (2.1) | 2.9 (1.4) | 3.3 (1.5) | 3.6 (2.2) |
Age at first birth (yrs)b | ||||||||
Mean age (SD) | 24.3 (5.1) | 25.3 (4.7) | 22.3 (4.8) | 26.2 (4.2) | 22.4 (6.2) | 23.9 (5.0) | 22.9 (4.1) | 22.5 (5.2) |
IQR | 21–27.5 | 22–27.8 | 19–25 | 23–28.3 | 18–26 | 19.8–27 | 19–23 | 19–26 |