Table 1.
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 |
BMI body mass index, cm centimetres, IQR inter-quartile range, SD standard deviation, yrs years
aPopulation groups and study source, by world region
White: White women in Australia (3 studies—Australian, Greek and Italian born), Canada, Netherlands, Norway, Poland, Spain, the UK (3 studies) and the USA (mainland: 3 studies, Hawaii: 1 study)
Black: Black women in Kenya, South Africa, the UK and the USA
East Asian: Chinese women in Hong Kong, Malaysia and Singapore; Japanese women in Japan, Korea and the USA (mainland: 1 study, Hawaii: 1 study)
South Asian: Malay women in Malaysia and Singapore; Indian women in India, Malaysia, Singapore and the UK
Mestizo: Mestizo women in Chile and Mexico
Hawaiian: Hawaiian women in USA (Hawaii: 1 study)
Middle Eastern: Egyptian women in Egypt; Arab women in Israel; Jewish women in Iran, Israel and Turkey
bNote raw data recorded categorically by some studies and subsequently converted to an approximated numerical value
cHeight data that were measured by the original study, as opposed to self-reported
dAmong women with non-missing data. Missing data on hormone therapy were 17% overall, < 4% for black, Hawaiian, Mestizo and East Asian, 15% missing for white women and 57% for Middle Eastern. These women were included in a missing-hormone-therapy category in later regression models