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Table 3 Incidence-based mortality studies for the evaluation of mammography screening effectiveness in Denmark and in Norway.

From: Breast cancer screening: evidence of benefit depends on the method used

  Years included in study Year of screening introduction in screening areas Age groups BC mortality rate in the pre-screening period (historical control) BC mortality rate in the screening period Ratio of BC mortality rates, screening versus pre-screening perioda Ratio of BC mortality rates, screening versus non-screening areasa
Screening areas     No screening Screening   
Denmark, Olsen et al. 2005 [28] 1981 to 2001 1991 50 to 79 69 52 0.75 0.74
Norway, Kalager et al. 2010 [33] 1986 to 2005 1996 50 to 84 33 24 0.73 0.9
Norway, Olsen et al. 2012 [34] 1990 to 2008 1996 50 to 84 35 27 0.77 0.91
Comparison (non-screening) areas     No screening No screening   
Denmark, Olsen et al. 2005 [28] 1981 to 2001 - 50 to 79 52 53 1.02 reference
Norway, Kalager et al. 2010 [33] 1986 to 2005 - 50 to 84 31 25 0.81 reference
Norway, Olsen et al. 2012 [34] 1990 to 2008 - 50 to 84 39 33 0.85 reference
  1. Figures in the table are breast cancer mortality rates per 100,000 women ages 50 to 79 in Denmark and 50 to 84 in Norway. aRate ratios may slightly differ from those of the original publications reported in Table 2 due to rounding and absence of statistical modelling. BC: breast cancer; NR: not reported.