Table 3.

ORs of the association between breast cancer death and attending screening

Cases, nControls, nOR (95% CI)OR (95% CI) corrected for self-selectiona
Index invitation
1990–2003
 Not screened3141,012
 Screened4412,7270.48 (0.41–0.58)0.56 (0.44–0.71)
1995–2003
 Not screened201503
 Screened2041,5160.30 (0.24–0.38)0.35 (0.26–0.46)
Index period
1990–2003
 Not screened278846
 Screened4772,8930.45 (0.37–0.54)0.51 (0.40–0.66)
1995–2003
 Not screened182461
 Screened2231,5580.31 (0.25–0.40)0.36 (0.27–0.49)

NOTE: CI calculated using conditional logistic regression.

  • aSelf-selection bias factor: 1.11.