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 value^{a} |
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 (cm^{3}) | FGV | 202.6 | 118.1 | 185.5 | 81.6 | 200.7 | 86.1 | 241.3 | 155.8 | 0.08 |
Total breast volume (cm^{3}) | 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 (cm^{2}) | DA | 10.2 | 11.5 | 27.8 | 17.2 | 45.9 | 24.3 | 59.2 | 33.6 | <0.0001 |
Total breast area (cm^{2}) | 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.
↵^{a}ANOVA tests were performed using square-root–transformed mammographic density measures.