From: High mammographic density in women of Ashkenazi Jewish descent
 | High adjusted PMD | Low adjusted PMD | P value |
---|---|---|---|
Percent dense tissue by volume | 72.7 (13.3) | 29.6 (6.4) | <10-3 |
Volume of dense breast tissue (ml) | 327.3 (215.0) | 166.2 (70.2) | <10-3 |
Volume of the breast (ml) | 479.1 (354.6) | 576.5 (242.9) | <10-3 |
Age (years) | 52.4 (9.7) | 51.7 (7.8) | 0.9 |
Body mass index (kg/m2) | 24.1 (6.5) | 23.9 (3.1) | <10-3 |
Age at first live birth | Â | Â | 0.1 |
   <30 years | 96 (20%) | 114 (24%) |  |
   ≥30 years or nulliparous | 378 (80%) | 354 (76%) |  |
   Unknown | 0 | 1 |  |
Menopausal status | Â | Â | Â |
   Premenopausal | 203 (43.3%) | 159 (34.3%) |  |
   Postmenopausal | 157 (33.5%) | 183 (39.4%) | 0.009* |
   Postmenopausal on hormone therapy | 71 (15.1%) | 77 (16.6%) | 0.7** |
   Unknown | 38 (8.1%) | 45 (9.7%) |  |
First-degree relative with breast cancer | Â | Â | 0.02 |
   Yes | 114 (24%) | 84 (18%) |  |
   No | 366 (76%) | 383 (82%) |  |
   Unknown | 0 | 2 |  |