Table 1 Participant characteristics at time of mammogram for breast cancer cases and controls by menopausal status.
All | Premenopausal | Postmenopausal | ||||
|---|---|---|---|---|---|---|
Cases (N = 1900) | Controls (N = 3921) | Cases (N = 844) | Controls (N = 1877) | Cases (N = 947) | Controls (N = 1800) | |
Mean (SD) | ||||||
Age (years) | 53.3 (9.0) | 52.6 (8.9) | 45.8 (4.5) | 46 (4.4) | 60.1 (6.9) | 59.6 (7.5) |
BMI (kg/m2) | 25.6 (4.9) | 25.9 (5.3) | 25.1 (5.0) | 25.6 (5.4) | 25.9 (4.7) | 26.1 (5.1) |
PMD | 37.6 (19.8) | 32.1 (19.6) | 46.1 (18.4) | 39.3 (19.1) | 29.7 (17.9) | 24.9 (17.2) |
APD | 18.5 (4.5) | 17.5 (4.7) | 19.8 (3.8) | 18.7 (4.2) | 17.3 (4.7) | 16.2 (4.9) |
V | 0.1 (0.9) | −0.1 (1.0) | 0.4 (0.9) | 0.1 (0.9) | −0.1 (1.0) | −0.3 (0.9) |
Year of mammogram | 1994.9 (4.5) | 1995.8 (4.8) | 1996.4 (4.3) | 1996.8 (4.4) | 1993.8 (4.2) | 1994.9 (4.9) |
Year of diagnosis | 1999.4 (4.4) | 2001 (4.2) | 1998.1 (4.2) | |||
N (%) | ||||||
Cohort | ||||||
NHS | 1179 (62.1) | 2163 (55.2) | 256 (30.3) | 546 (29.1) | 836 (88.3) | 1458 (81) |
NHSII | 721 (37.9) | 1758 (44.8) | 588 (69.7) | 1331 (70.9) | 111 (11.7) | 342 (19) |
HT use | ||||||
Never | 1109 (58.4) | 2505 (63.9) | 844 (100) | 1877 (100) | 234 (24.7) | 540 (30) |
Past | 574 (30.2) | 949 (24.2) | 510 (53.9) | 832 (46.2) | ||
Current | 177 (9.3) | 404 (10.3) | 168 (17.7) | 373 (20.7) | ||
Unknown | 40 (2.1) | 63 (1.6) | 35 (3.7) | 55 (3.1) | ||
ER status | ||||||
ER+ | 1253 (65.9) | 565 (66.9) | 616 (65) | |||
ER− | 279 (14.7) | 135 (16) | 131 (13.8) | |||
Unknown | 368 (19.4) | 144 (17.1) | 200 (21.1) | |||
PR status | ||||||
PR+ | 1070 (56.3) | 513 (60.8) | 496 (52.4) | |||
PR− | 429 (22.6) | 178 (21.1) | 228 (24.1) | |||
Unknown | 401 (21.1) | 153 (18.1) | 223 (23.5) | |||
ER/PR status | ||||||
ER+/PR+ | 1036 (54.5) | 500 (59.2) | 476 (50.3) | |||
ER+/PR− | 188 (9.9) | 56 (6.6) | 120 (12.7) | |||
ER−/PR− | 241 (12.7) | 122 (14.5) | 108 (11.4) | |||
Unknown | 435 (22.9) | 166 (19.7) | 243 (25.7) | |||
