Table 1 The effectiveness of mammographic screening on breast cancer mortality expressed by odds ratios, according to calendar period of index-invitation at screening and corrected for age at invitation
From: Increasingly strong reduction in breast cancer mortality due to screening
Calendar period of index-invitation | Cases screened (unscreened) | Referents screened (unscreened) | Odds ratio (95% CI) |
|---|---|---|---|
1975–2008 | 191 (91) | 1089 (321) | 0.65 (0.49–0.87) |
1975–1991 | 90 (40) | 501 (149) | 0.72 (0.47–1.09) |
1992–2008 | 29 (23) | 202 (58) | 0.35 (0.19–0.64) |
