Table 3.
Screening performance measurements and relative risks (95% CI) among Volpara density grade categories
| BC incidence rate (only invasive) | |||
| Cases/person-years | Rate | RR (95% CI) | |
| VDG1–3 | 110/30390 | 3.6‰ | reference |
| VDG 4 | 56/7513 | 7.5‰ | 2.0 (1.5–2.8) |
| Interval cancer rate | |||
| Cases/negative screened | Rate | RR (95% CI) | |
| VDG1–3 | 18/12709 | 1.4‰ | reference |
| VDG 4 | 22/3129 | 7.0‰ | 5.0 (2.7–9.2) |
| Advanced cancers rate among negative screened | |||
| Cases/negative screened | Rate | RR (95% CI) | |
| VDG1–3 | 14/12709 | 1.1‰ | reference |
| VDG 4 | 13/3129 | 4.2‰ | 3.8 (1.8–8.0) |
VDG Volpara density grade, BC breast cancer, RR relative risk