Table 2.
Number of person-years, invasive breast cancer cases by detection mode, interval cancer ratio, and breast cancer incidence by age group
| Age at invitation | Person-years | PSD | SSD | IC | NP | IC ratio (%)a | BCI (per 105)b |
|---|---|---|---|---|---|---|---|
| 50–54 | 1,163,586.1 | 875 | 721 | 736 | 697 | 31.6 | 260 |
| 55–59 | 1,264,796.0 | 277 | 1507 | 955 | 793 | 34.9 | 279 |
| 60–64 | 1,098,407.1 | 316 | 2001 | 872 | 655 | 27.3 | 350 |
| 65–69c | 1,157,223.7 | 331 | 2277 | 975 | 660 | 27.2 | 367 |
| Total | 4,684,012.9 | 1799 | 6506 | 3538 | 2805 | 29.9 | 313 |
Abbreviations: BCI breast cancer incidence, IC interval cancer, NP non-participant, PSD prevalent screen-detected cases, SSD subsequent screen-detected cases
aNumber of ICs divided by the sum of screen-detected and ICs
bTotal number of breast cancers divided by person-years
c9.65% of the women were also invited to screening at age 70–74 from 2012