Table 1.

Quantitative mammographic density measurements by BI-RADS breast density categories, The BREAST Stamp Project, 2007–2010 (n = 413)

BI-RADS density categories
I: entirely fat(n = 56)II: scattered densities (n = 183)III: hetero-geneously dense (n = 131)IV: extremely dense (n = 33)
VariableAbbreviationMeanSDMeanSDMeanSDMeanSDANOVA P valuea
Volume measures
 Percent fibroglandular volume (%)% FGV18.39.031.714.148.718.372.919.0<0.0001
 Absolute fibroglandular volume (cm3)FGV202.6118.1185.581.6200.786.1241.3155.80.08
 Total breast volume (cm3)1,148.6420.9690.4372.0485.1307.5363.5258.0<0.0001
Area measures
 Percent dense area (%)PD4.34.319.311.340.414.862.311.7<0.0001
 Absolute dense area (cm2)DA10.211.527.817.245.924.359.233.6<0.0001
 Total breast area (cm2)239.076.0156.263.2118.956.495.748.9<0.0001

NOTE: P values <0.05 are presented in bold font.

  • aANOVA tests were performed using square-root–transformed mammographic density measures.