Table 1 Cancer detection by screening round in a trial of annual mammographic screeningstarting age 40, UK.
Screening round | Women screened1 | Screen-detected cancers | ICs2 in the first 12 months | Mean age (years) | Mean screening interval (years) | ||
|---|---|---|---|---|---|---|---|
| Â | Â | INV3 | IS 4 | INV3 | IS 4 | Â | Â |
1 | 36 348 | 31 | 6 | 7 | 2 | 40.5 | - |
2 | 30 779 | 20 | 3 | 17 | 2 | 41.6 | 1.1 |
3 | 27 083 | 16 | 3 | 17 | 0 | 42.6 | 1.1 |
4 | 24 188 | 15 | 5 | 17 | 1 | 43.7 | 1.1 |
5 | 21 107 | 16 | 4 | 10 | 0 | 44.7 | 1.0 |
6 | 18 603 | 13 | 7 | 16 | 1 | 45.6 | 1.0 |
7 | 17 193 | 19 | 9 | 18 | 1 | 46.6 | 1.0 |
8 | 13 998 | 21 | 6 | 11 | 2 | 47.5 | 0.9 |
Total | 189 299 | 151 | 43 | 113 | 9 | 43.4 | Â |