Table 4 Cumulative numbers of breast cancer cases observed with and without screening
Age range observed, years | Years of follow-up | Number of cases | Observed percentage excess | |
|---|---|---|---|---|
| Â | Â | Without screening | With screening | incidence With screening |
50-69 | 5 | 50,270 | 102,380 | 102 |
| Â | 10 | 101,440 | 153,460 | 51 |
| Â | 15 | 152,160 | 226,680 | 49 |
| Â | 20 | 202,880 | 277,060 | 37 |
| Â | 25 | 253,600 | 304,080 | 20 |
| Â | 30 | 304,320 | 351,260 | 15 |
50-74 | 5 | 65,300 | 113,400 | 74 |
| Â | 10 | 130,600 | 170,500 | 31 |
| Â | 15 | 195,900 | 250,100 | 28 |
| Â | 20 | 261,200 | 307,675 | 18 |
| Â | 25 | 326,500 | 341,975 | 5 |
| Â | 30 | 391,800 | 402,100 | 3 |
50-79 | 5 | 77,980 | 126,069 | 62 |
| Â | 10 | 155,960 | 195,018 | 25 |
| Â | 15 | 233,940 | 285,435 | 22 |
| Â | 20 | 311,920 | 354,714 | 14 |
| Â | 25 | 389,900 | 400,239 | 3 |
| Â | 30 | 467,880 | 472,014 | 1 |