Table 2 Cohort size, person years and incident cases of breast cancer subtypes across five-year age bands.
| Â | Age bands | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|  | ≤ 49 years | 50-54 years | 55-59 years | 60-64 years | ≥ 65 years | All women | |||||
Subjects at risk | 141513 | 175268 | 185404 | 161850 | 113810 | 314670 | |||||
Person years | 870491 | 627875 | 661652 | 565289 | 673872 | 3399178 | |||||
Total cases 1 | 1205 | (12.6%) | 1770 | (18.6%) | 2151 | (22.6%) | 2065 | (21.7%) | 2339 | (24.5%) | 9530 |
ER-positive | 507 | (8.8%) | 1031 | (17.9%) | 1402 | (24.3%) | 1345 | (23.3%) | 1479 | (25.7%) | 5764 |
ER-negative | 235 | (16.7%) | 306 | (21.7%) | 320 | (22.7%) | 294 | (20.9%) | 255 | (18.1%) | 1410 |
ER-missing | 463 | (19.7%) | 433 | (18.4%) | 429 | (18.2%) | 426 | (18.1%) | 605 | (25.7%) | 2356 |
PR-positive | 462 | (12.1%) | 755 | (19.8%) | 872 | (22.9%) | 839 | (22.0%) | 880 | (23.1%) | 3808 |
PR-negative | 212 | (10.0%) | 397 | (18.8%) | 553 | (26.2%) | 499 | (23.6%) | 453 | (21.4%) | 2114 |
PR-missing | 531 | (14.7%) | 618 | (17.1%) | 726 | (20.1%) | 727 | (20.1%) | 1,006 | (27.9%) | 3608 |
ER+PR+ | 390 | (10.9%) | 698 | (19.5%) | 830 | (23.1%) | 806 | (22.5%) | 862 | (24.0%) | 3586 |
ER+PR- | 64 | (5.9%) | 180 | (16.6%) | 306 | (28.2%) | 280 | (25.8%) | 256 | (23.6%) | 1086 |
ER-PR+ | 71 | (33.3%) | 57 | (26.8%) | 37 | (17.4%) | 31 | (14.6%) | 17 | (8.0%) | 213 |
ER-PR- | 147 | (14.4%) | 217 | (21.3%) | 244 | (23.9%) | 217 | (21.3%) | 196 | (19.2%) | 1021 |
ER or PR missing | 533 | (14.7%) | 618 | (17.1%) | 734 | 20.3% | 731 | (20.2%) | 1008 | (27.8%) | 3624 |