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) | |||||||
| Variable | Abbreviation | Mean | SD | Mean | SD | Mean | SD | Mean | SD | ANOVA P valuea |
| Volume measures | ||||||||||
| Percent fibroglandular volume (%) | % FGV | 18.3 | 9.0 | 31.7 | 14.1 | 48.7 | 18.3 | 72.9 | 19.0 | <0.0001 |
| Absolute fibroglandular volume (cm3) | FGV | 202.6 | 118.1 | 185.5 | 81.6 | 200.7 | 86.1 | 241.3 | 155.8 | 0.08 |
| Total breast volume (cm3) | 1,148.6 | 420.9 | 690.4 | 372.0 | 485.1 | 307.5 | 363.5 | 258.0 | <0.0001 | |
| Area measures | ||||||||||
| Percent dense area (%) | PD | 4.3 | 4.3 | 19.3 | 11.3 | 40.4 | 14.8 | 62.3 | 11.7 | <0.0001 |
| Absolute dense area (cm2) | DA | 10.2 | 11.5 | 27.8 | 17.2 | 45.9 | 24.3 | 59.2 | 33.6 | <0.0001 |
| Total breast area (cm2) | 239.0 | 76.0 | 156.2 | 63.2 | 118.9 | 56.4 | 95.7 | 48.9 | <0.0001 | |
NOTE: P values <0.05 are presented in bold font.
↵aANOVA tests were performed using square-root–transformed mammographic density measures.