Table 2.
Magnetic resonance elastography (MRE) parameters and Magnetic Resonance Imaging (MRI) background parenchymal enhancement (BPE) by risk status and breast density
| Characteristic | Average risk |
High risk |
||||
|---|---|---|---|---|---|---|
| Non-dense (N = 16) | Dense (N = 34) | p-valuea | Non-dense (N = 31) | Dense (N = 55) | p-valuea | |
|
| ||||||
| Breast stiffness | 0.14 | 0.09 | ||||
| Mean (SD) | 1.07 (0.18) | 1.16 (0.21) | 1.69 (1.19) | 2.14 (1.12) | ||
| Median (range) | 1.05 (0.65–1.44) | 1.15 (0.76–1.67) | 1.09 (0.54–4.36) | 1.37 (0.92–4.09) | ||
| Breast elasticity | 0.01 | 0.06 | ||||
| Mean (SD) | 0.96 (0.15) | 1.10 (0.20) | 1.57 (1.08) | 2.03 (1.08) | ||
| Median (range) | 0.96 (0.61–1.21) | 1.10 (0.74–1.58) | 1.03 (0.52–3.85) | 1.32 (0.74–3.99) | ||
| Breast viscosity | 0.78 | 0.13 | ||||
| Mean (SD) | 0.23 (0.09) | 0.23 (0.07) | 0.26 (0.27) | 0.35 (0.24) | ||
| Median (range) | 0.23 (0.08–0.39) | 0.23 (0.11–0.44) | 0.20 (0.0–1.39) | 0.27 (−0.05–1.05) | ||
| BPE (#, % minimal or mild) | 14 (87.5%) | 20 (58.8%) | 0.06 | 28 (90.3%) | 35 (63.6%) | 0.01 |
Breast stiffness, elasticity, and viscosity were averaged across the left and right breasts
a
For breast stiffness, elasticity, and viscosity, the p-value was based on a two-sample t-test allowing for unequal variances. For BPE, the p-value was based on Fisher’s exact test