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Table 1 Screened women, screen detected cancers, interval cancers and background annual incidence by screening location in primarily initial 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 1991-‘93 50-69 30,362 360 52 100 118.6 17.3 25.4 0.34 0.13 (0.10-0.16)
Njor et al. [6] Funen, Denmark 1993-‘95 50-69 41,480 398 87 100 95.9 21.2 24.2 0.43 0.18 (0.15-0.21)
Törnberg et al. [7] Stockholm, Sweden 1989-‘97 50-69 188,032 1,108 382 100 58.9 20.4 25.8 0.40 0.26 (0.24-0.28)
Törnberg et al. [7] Four counties, Norway 1996-‘97 50-69 126,779 852 207 100 67.2 16.4 20.0 0.41 0.20 (0.18-0.22)
Hofvind et al. [4] NBCSP, Norway 1996-‘05 50-69 367,428a 2,351 669 100 64.0 18.3 18.0 0.51 0.22 (0.21-0.23)
Törnberg et al. [7] Marseille, France 1993-‘98 50-69 103,946 483 179 100 46.5 17.3 20.1 0.43 0.27 (0.24-0.30)
Törnberg et al. [7] Strasbourg, France 1989-‘97 50-65 63,235 328 129 100 51.9 20.5 22.6 0.45 0.28 (0.24-0.32)
Törnberg et al. [7] Florence, Italy 1990-‘94 50-69 35,754 325 47 100 90.9 13.3 22.2 0.30 0.13 (0.10-0.16)
Törnberg et al. [7] Turin, Italy 1992-‘96 50-69b 28,804 248 40 100 86.1 14.0 20.2c 0.35 0.14 (0.10-0.18)
Vettorazzi et al. [8] Veneto Region, Italy 1999-‘02 50-69 94,874d 683 154 73 72.0 16.3 27.8 0.29 0.18 (0.15-0.21)
Törnberg et al. [7] Navarra, Spain 1990-‘96 45-65 40,665 256 29 100 63.0 7.2 16.2 0.22 0.10 (0.07-0.13)
  1. aOnly 367,428 prevalent screens from a total of 467,343 women had 2 years of follow-up.
  2. bAlthough 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.
  3. cBased on the ages 50-64.
  4. dWomen-Years at risk. Follow-up was not complete in the second year of the interval resulting in only 77,979 women-years.
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