Fig. 5

Associations of a STRATUS area mammographic densities and b Volpara volumetric mammographic densities, with breast cancer risk in premenopausal women. *Adjusted for relevant confounding factors. ^†Reference category is cBIRADS 1 (< 2%) + cBIRADS 2 (2− < 17%). ‡ Reference category is VDG 1 (< 4.8%) + VDG 2 (4.8—< 8.0%). ^§Z-tests comparing estimated regression coefficients between the STRATUS and Volpara studies