Table 2. Breast cancer mortality reduction due to screening compared with no screening in a cohort of British women followed up from age 40 to 85 years for various screening age ranges and frequencies.
|
Breast cancer mortality reduction |
|
|---|---|
| Scenario (frequency and age range) | Mean (95% CI) |
| Triennial, 50–70 |
15.9 (15.0, 16.8) |
| Triennial, 47–73 |
18.1 (17.3, 19.0) |
| Triennial, 40–73 |
20.1 (19.2, 21.1) |
| Combinationa |
21.3 (20.5, 22.1) |
| Annual, 47–73 |
35.0 (34.2, 35.7) |
| Annual, 40–73 | 36.7 (35.9, 37.5) |
Abbreviation: CI=confidence interval.
a
Annual screening from age 40 followed by triennial screening from age 47 to 73.