Skip to main content

Table 2 Randomised controlled trials of mammography screening: differences in breast cancer incidence between intervention and control arms in the follow-up period

From: Overdiagnosis and overtreatment of breast cancer: Overdiagnosis in randomised controlled trials of breast cancer screening

  Cumulative incidence of invasive breast cancer (per 1,000 women years) Cumulative incidence of DCIS (per 1,000 women years) Cumulative incidence of all breast cancer (invasive + DCIS) (per 1,000 women years)   
Study Control group Absolute excess in intervention arm 95% Cl Control group Absolute excess in intervention arm 95% Cl Control group Absolute excess in intervention arm 95% Cl Follow-up (years) Control group screened
Two County 2.54 -0.13a -0.29, 0.04 0.12 0.11 0.07, 0.15 2.66 -0.02 -0.19, 0.15 11 Yes
Stockholm 0.85 -0.04 -0.18, 0.10 0.06 0.03 -0.00, 0.07 0.91 -0.03 0.15, 0.14 5 Yes
Goteberg 1.73 -0.17 -0.42, 0.08 0.17 0.05 -0.03, 0.14 1.90 -0.11 -0.38, 0.15 8 Yes
HIP 1.94 0.09a -0.24, 0.39 No data No data No data 1.94 0.07 -0.24, 0.39 5 No
Malmö I 2.12 0.50 0.18, 0.81 0.27 0.23 0.11, 0.36 2.39 0.73 0.39, 1.07 8.8 No
NBSS I 1.68 0.12 -0.08, 0.32 0.09 0.13 0.07, 0.18 1.77 0.25 0.04, 0.46 13 No
NBSS II 2.38 0.04 -0.22, 0.31 0.06 0.21 0.14, 0.28 2.44 0.26 -0.02, 0.54 13 No
Edinburgh 1.93 0.11 -0.15, +0.38 0.05 0.13 0.07, 0.20 1.98 0.25 -0.00, 0.53 10 No
  1. aAll breast cancers. CI, confidence interval; DCIS, ductal carcinoma in situ; HIP, Health Insurance Plan; NBSS, National Breast Screening Study.