Table 3.
Accumulated results for a single cohort of women aged 50 years from 1996 to 2011. Detailed legend: Main results of a single cohort of women aged 50 years invited to participate in the Basque breast cancer screening programme for the first time in 1996
| Screened population | Non-screened population | |||
|---|---|---|---|---|
| Mean | 95 % CI | Mean | 95 % CI | |
| Number of women | 50,000 | (50,000, 50,000) | 50,000 | (50,000, 50,000) |
| Screening age | 50-69 years old | - | - | |
| Participation rate | 100 % | 0 % | (0.0 %, 0.0 %) | |
| Number of mammograms | 480,869 | (480,150, 481,588) | 0 | (0, 0) |
| False positive results | 3,151 | (3,041, 3,260) | 0 | (0, 0) |
| False positive/women | 6.3 % | (6.1 %, 6.5 %) | - | - |
| False positive/mammography | 0.7 % | (0.6 %, 0.7 %) | - | - |
| Screen detected BC | 1,776 | (1,696, 1,856) | 0 | (0, 0) |
| Total detected BC | 5,065 | (4,926, 5,204) | 5,001 | (4,863, 5,139) |
| Difference in BC detection (Overdiagnosis) | 64 | (49, 79) | - | - |
| Increase in BC incidence | - | - | 1.3 % | (1.0 %, 1.6 %) |
| Overdiagnosis/Screening-detected BC | 3.6 % | (2.8 %, 4.4 %) | - | - |
| BC deaths | 1,634 | (1,556, 1,711) | 1,880 | (1,795, 1,964) |
| Difference in BC deaths | - | - | 246 | (215, 278) |
| Difference in BC deaths/BC deaths | - | - | 13.1 % | (11.6 %, 14.6 %) |
| Life years/women | 82.6 | (82.5, 82.7) | 82.5 | (82.4, 82.6) |
| Life years gained/women | 0.09 | (0.08, 0.10) | - | - |
| Life years gained/screen detected women | 2.5 | (2.2, 2.8) | - | - |
BC Breast cancer, CI Confidence interval