Table 2 Odds ratios for risk of death from breast cancer by screening history 1995–2004
Screening factors | No. of cases/controls | Odds ratio (95% CI) |
|---|---|---|
Ever attended | ||
Never | 77/63 | 1 |
Ever | 207/505 | 0.35 (0.24, 0.50) |
Self-selection corrected (invitation effect) | 0.65 (0.48, 0.88) | |
Self-selection corrected (screening effect) | 0.52 (0.32, 0.84) | |
Number of screens attended | ||
1 | 86/185 | 1 |
2 | 66/198 | 0.70 (0.43, 1.11) |
3+ | 55/122 | 1.03 (0.59, 1.77) |
None | 77/63 | 2.51 (1.56, 4.03) |
Time since last screen | ||
<1 year | 65/113 | 1 |
1<2 years | 41/121 | 0.43 (0.24, 0.77) |
2<4 years | 62/175 | 0.48 (0.28, 0.81) |
4+ years | 39/96 | 0.55 (0.29, 1.04) |
Never screened | 77/63 | 1.71 (1.03, 2.80) |
Age at first screen (screened women only) | ||
<52 | 53/144 | 1 |
52–53 | 50/91 | 2.38 (1.02, 5.57) |
54<58 | 60/137 | 2.25 (0.83, 6.09) |
>58 | 44/133 | 1.54 (0.33, 7.01) |
