Table 1.
Characteristics of women with a diagnosis of breast cancer in the Netherlands during implementation of screening in women aged 70-75 years, presented per age group. Values are numbers (percentages) unless stated otherwise
| Diagnosis by age group | Period | ||
|---|---|---|---|
| Prescreening (1995-97) | Screening uptake (1998-2002) | Active screening (2003-11) | |
| 70-75 years (n=25 414) | |||
| Stage at diagnosis: | |||
| Carcinoma in situ | 156 (4.6) | 718 (9.1) | 1477 (10.5) |
| I | 986 (28.8) | 3346 (42.3) | 6824 (48.5) |
| II | 1632 (47.6) | 2994 (37.8) | 4015 (28.5) |
| III | 371 (10.8) | 472 (6.0) | 1206 (8.6) |
| IV | 283 (8.3) | 381 (4.8) | 553 (3.9) |
| Source population (person years) | 1 115 508 | 1 842 139 | 3 394 055 |
| 76-80 years (n=13 028) | |||
| Stage at diagnosis: | |||
| Carcinoma in situ | 121 (5.5) | 207 (5.0) | 436 (6.5) |
| I | 584 (26.6) | 1058 (25.4) | 1851 (27.7) |
| II | 1038 (47.3) | 2013 (48.4) | 2781 (41.7) |
| III | 243 (11.1) | 434 (10.4) | 1041 (15.2) |
| IV | 210 (9.6) | 449 (10.8) | 589 (8.8) |
| Source population (person years) | 686 507 | 1 282 037 | 2 386 061 |