Test sensitivity by person-years of observation within the 2-year period after the first and second rounds
| After the 1st round | After the 2nd round | |||
| Men | Women | Men | Women | |
| Person-years | 27 543 | 31 692 | 24 364 | 28 445 |
| Observed interval cancers | 17 | 21 | 21 | 17 |
| Per 1000 | 0.617 | 0.663 | 0.862 | 0.598 |
| % of expected incidence detected by screening | ||||
| England-based population | 70.7 | 49.6 | 64.9 | 50.8 |
| West Midlands-based population | 76.1 | 53.0 | 71.0 | 54.7 |