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Table 1 Cancer detection by screening round in a trial of annual mammographic screeningstarting age 40, UK.

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

Screening round Women screened1 Screen-detected cancers ICs2 in the first 12 months Mean age (years) Mean screening interval (years)
   INV3 IS 4 INV3 IS 4   
1 36 348 31 6 7 2 40.5 -
2 30 779 20 3 17 2 41.6 1.1
3 27 083 16 3 17 0 42.6 1.1
4 24 188 15 5 17 1 43.7 1.1
5 21 107 16 4 10 0 44.7 1.0
6 18 603 13 7 16 1 45.6 1.0
7 17 193 19 9 18 1 46.6 1.0
8 13 998 21 6 11 2 47.5 0.9
Total 189 299 151 43 113 9 43.4  
  1. 1Only includes women screened at all previous rounds;2interval cancer; 3invasive carcinomas;4in-situ carcinomas.