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Table 2 Number of person-years, invasive breast cancer cases by detection mode, interval cancer ratio, and breast cancer incidence by age group

From: Overdiagnosis in the population-based organized breast cancer screening program estimated by a non-homogeneous multi-state model: a cohort study using individual data with long-term follow-up

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
  1. Abbreviations: BCI breast cancer incidence, IC interval cancer, NP non-participant, PSD prevalent screen-detected cases, SSD subsequent screen-detected cases
  2. aNumber of ICs divided by the sum of screen-detected and ICs
  3. bTotal number of breast cancers divided by person-years
  4. c9.65% of the women were also invited to screening at age 70–74 from 2012