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Table 1 Randomised controlled trials of mammographic screening

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

Study Age range at entry (years) Screening interval (months) Number of views Uptake rate (%) (prevalent screen) Relative risk of breast cancer mortality Follow-up (years)
HIP 40–64 12 2 67 0.78 18
Two County 40–74 24–33 1 89 0.70 11
Malmö I 45–70 18–24 2 74 0.81 19
Malmö II 43–49 18–24 2 75–80 0.65 9
Stockholm 40–64 28 1 81 0.90 15
Goteborg 39–59 18 2 84 0.78 13
NBSS Ia 40–49 12 2 100 1.06 13
NBSS IIb 50–59 12 2 100 1.02 13
Edinburgh 45–64 12c 2 61 0.78 13
  1. aComparison of annual mammography, clinical breast examination (CBE) and breast self-examination (BSE) instruction with a single CBE and BSE instruction. bComparison of annual mammography with annual CBE. cMammography and CBE every 24 months; CBE only in intervening years. HIP, Health Insurance Plan; NBSS, National Breast Screening Study.