Table 1.

Design aspects and odds ratios (ORs) (crudes and corrected for self-selection bias) of six case-control studies.

Paper	Country	Time period of breast cancer deaths	Cases (n)	Screening exposure	Crude Ors (95% CI)	ORs adjusted for self-selection bias
Allgood et al. [15]	UK	1995-2004	284	Ever/Never attendance before (pseudo) diagnosis	0.35 (0.24-0.51)	0.52 (0.32-0.84)
Fielder et al. [16]	Wales	1998-2001	419	Ever/Never attendance before (pseudo) diagnosis	0.62 (0.47-0.82)	0.75 (0.49-1.14)
Gabe et al. [17]	Iceland	1990-2002	226	Ever/Never attendance before (pseudo) diagnosis	0.59 (0.41-0.84)	0.65 (0.39-1.09)
Paap et al. [18]	Netherlands	2004-2005	118	Screened at index invitation	0.30 (0.14-0.63)	0.24 (0.10-0.58)
Puliti et al. [19]	Italy	1988-2002	1750	Ever/Never attendance before (pseudo) diagnosis	0.46 (0.38-0.56)	0.55 (0.36-0.85)
Roder et al. [20]	Australia	2002-2005	491	Ever/Never attendance before (pseudo) diagnosis	0.59 (0.47-0.74)	0.70a

Source: Paap et al., 2010 [11] modified.

^aValues of confidence interval not reported in the paper.