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Table 5 Comparison of the number of cancers detected for 1,000,000 women in annualscreening between ages 40 to 49 years versus no screening versus.

From: Modelling the overdiagnosis of breast cancer due to mammography screening in womenaged 40 to 49 in the United Kingdom

  Ages 40 to 49 Ages 50 to 54 Ages 40 to 54
  Group 1 Annual screening Group 2 No screening Group 1 No screening Group 2 No screening Group 1 Total Group 2 Total
Base-case
Screen-detected       
Invasive 7772 - - - 7772 -
Progressive in situ 1145 - - - 1145 -
Non-progressive in situ 874 - - - 874 -
Clinically detected       
Invasive 5693 14 089 7680 8151 13 373 22 240
Non-progressive in situ 546 1336 658 728 1204 2064
All cancers 16 030 15 425 8338 8879 24 368 24 304
Overdiagnosis      
Absolute number 605 -541 64
% of screen-detected 6.2    0.7
% of cancers diagnosed within ages 40 to 49 3.8    0.4
  1. Estimates from the overdiagnosis model.