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Table 3 Screening performance measurements and relative risks (95% CI) among Volpara density grade categories

From: Volumetric breast density and risk of advanced cancers after a negative screening episode: a cohort study

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)
  1. VDG Volpara density grade, BC breast cancer, RR relative risk