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Table 3 Poisson regression analysis with estimated risk ratios for in situ and invasive breast cancer combined in Denmark adjusted for increasing background incidence, geographical differences in pre-screening incidence, and delayed start of screening in Funen.

From: Overdiagnosis in organised mammography screening in Denmark. A comparative study

  RR (95% CI)
1971 (reference) 1.0 (APC 0,37%, 0.30-0.45)
Screening effects, women aged 50-69 years
   First round 2.07 (1.94 to 2.21)
   Later rounds 1.34 (1.29 to 1.40)
Women aged 70-74 years
   1998-2003 0.89 (0.80 to 0.98)
Women aged 70-79 years
   1998-2003 0.90 (0.85-0.96)
Pre-screening difference (screened vs. rest)
   All ages 0.90 (0.89 to 0.92)