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Table 2 Screened women, screen detected cancers, interval cancers and background annual incidence by screening location in primarily subsequent screening rounds

From: A simple way to measure the burden of interval cancers in breast cancer screening

Reference Screening program location Year (of invitation) Age Screened women Screen-detected cases Interval cancers Pct. of initial screens [Screen-detected per 10.000] [Interval cancers per 10.000] Background annual incidence rate per 10.000 Total I C rate background rate Interval cancers total cancers 95 % C I
Mammography screening evaluation group [5] Copenhagen, Denmark 1993-‘95 50-69 26,063 163 53 18 62.5 20.5 25.4 0.40 0.25 (0.19-0.31)
Njor et al. [6] Funen, Denmark 1996-‘97 50-69 43,543 227 105 19 52.1 24.2 26.0 0.47 0.32 (0.27-0.37)
Törnberg et al.[7] Stockholm, Sweden 1989-‘97 50-69 270,260 1,075 584 0 39.8 21.7 23.7 0.46 0.35 (0.33-0.37)
Hofvind et al.[4] NBCSP, Norway 1998-‘05 50-69 336,323a 1,648 610 0 49.0 18.2 18.2 0.51 0.27 (0.25-0.29)
Törnberg et al.[7] Pirkanmaa, Finland 1988-‘97 50-69 75,927 235 121 42 31.0 16.0 13.1b 0.61 0.34 (0.29-0.39)
Törnberg et al.[7] Marseille, France 1993-‘98 50-69 36,140 171 65 0 47.3 18.1 20.1 0.45 0.28 (0.22-0.34)
Törnberg et al.[7] Strasbourg, France 1989-‘97 50-65 104,951 390 230 0 37.2 22.0 22.6 0.49 0.37 (0.33-0.41)
Törnberg et al.[7] Florence, Italy 1990-‘94 50-69 13,394 54 28 0 40.3 21.0 22.2 0.47 0.34 (0.24-0.44)
Törnberg et al.[7] Turin, Italy 1992-‘96 50-69c 13,117 82 25 0 62.5 19.2 20.2d 0.47 0.23 (0.15-0.31)
Törnberg et al.[7] Navarra, Spain 1990-‘96 45-65 85,653 268 77 0 31.3 9.0 16.2 0.28 0.22 (0.18-0.26)
  1. aOnly 336,323 prevalent screens from a total of 467,343 women had 2 years of follow-up.
  2. bbased on the ages 50-59 years.
  3. cAlthough the age group targeted in Turin is 50-69 years, during the period of the study, invitations were restricted to women aged 50-59. A few women had the test shortly after they turned 60. and all women invited for the first time in their 50s received their subsequent invitations even after they turned 60.
  4. dBased on the ages 50-64.
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