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Table 3 Accumulated results for a single cohort of women aged 50 years from 1996 to 2011. Detailed legend: Main results of a single cohort of women aged 50 years invited to participate in the Basque breast cancer screening programme for the first time in 1996

From: Evaluation of health benefits and harms of the breast cancer screening programme in the Basque Country using discrete event simulation

  Screened population Non-screened population
  Mean 95 % CI Mean 95 % CI
Number of women 50,000 (50,000, 50,000) 50,000 (50,000, 50,000)
Screening age 50-69 years old   - -
Participation rate 100 %   0 % (0.0 %, 0.0 %)
Number of mammograms 480,869 (480,150, 481,588) 0 (0, 0)
False positive results 3,151 (3,041, 3,260) 0 (0, 0)
False positive/women 6.3 % (6.1 %, 6.5 %) - -
False positive/mammography 0.7 % (0.6 %, 0.7 %) - -
Screen detected BC 1,776 (1,696, 1,856) 0 (0, 0)
Total detected BC 5,065 (4,926, 5,204) 5,001 (4,863, 5,139)
Difference in BC detection (Overdiagnosis) 64 (49, 79) - -
Increase in BC incidence - - 1.3 % (1.0 %, 1.6 %)
Overdiagnosis/Screening-detected BC 3.6 % (2.8 %, 4.4 %) - -
BC deaths 1,634 (1,556, 1,711) 1,880 (1,795, 1,964)
Difference in BC deaths - - 246 (215, 278)
Difference in BC deaths/BC deaths - - 13.1 % (11.6 %, 14.6 %)
Life years/women 82.6 (82.5, 82.7) 82.5 (82.4, 82.6)
Life years gained/women 0.09 (0.08, 0.10) - -
Life years gained/screen detected women 2.5 (2.2, 2.8) - -
  1. BC Breast cancer, CI Confidence interval