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Table 2 Summary of main incidence-based mortality studies on breast cancer screening.

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

Study Country Areas in study Age of screened women Data on treatments in screening and non-screening areas Comparison areas where no screening existed during the entire screening period Historical comparison areasa Effect of screening on the risk of BC death Adjustment of results for:
         Self-selection Incidence Lead time
Tabár et al. 2003 [27] Sweden Dalarna and Kopparberg counties 40 to 69 No No No -45% Yes Yes No
Olsen et al. 2005 [28] Denmark Copenhagen where screening took place compared to the rest of the country 50 to 69 No Yes Yes -25% No No No
SOSSEG 2006 [29] Sweden About half of Swedish counties 40(50) to 69(74) Yes, but only in non-participants No No -27% Yes Yes No
Jonsson 2007 [30] Sweden Four Swedish counties 40 to 74 No Yes No -26% Yes No Yes
Anttila et al. 2008 [31] Finland All the country 50 to 69 No No No -11% No No No
Hellquist et al. 2010 [32] Sweden All Swedish counties 40 to 49 No Yes No -26% Yes No Yes
Kalager et al. 2010 [33] Norway Four counties with pilot program plus comparison counties 50 to 69 No Yes Yes -10% (NS) No No No
Olsen et al. 2012 [34] Norway Four counties with pilot program plus comparison counties 50 to 69 No Yes Yes -7 (NS) No No No
  1. BC: breast cancer; NS: statistically non-significant. aData on breast cancer death rates in historical comparison groups, that is, in screening areas and in comparison areas before screening started in screening areas.