Table 1.
General characteristics of the case group and control group.
| Characteristics | Case group (466 cases) | Control group (932 cases) | P value |
| Age | 50.22 (26∼81) | 50.06 (26∼81) | .252 |
| BMI | 24.18 | 23.95 | .000 |
| Age at menarche | 14.57 | 14.51 | .126 |
| Age at first childbirth | 24.83 | 24.85 | .149 |
| Menstrual status | .000 | ||
| Premenopausal | 298 (63.9) | 485 (52.0) | |
| Postmenopausal | 168 (36.1) | 447 (48.0) | |
| Number of births | .380 | ||
| 0 | 14 (3.0) | 28 (3.0) | |
| 1 | 187 (40.1) | 417 (44.7) | |
| 2 | 188 (40.3) | 336 (36.1) | |
| ≥3 | 77 (16.5) | 151 (16.2) | |
| BI-RADS classification | .000 | ||
| a. completely fat | 34 (7.3) | 137 (14.7) | |
| b. scattered dense areas | 94 (20.2) | 262 (28.1) | |
| c. heterogeneously dense | 228 (48.9) | 411 (44.1) | |
| d. extremely dense | 110 (23.6) | 122 (13.1) | |
| Quantra classification | .000 | ||
| 1. completely fat | 13 (2.8) | 48 (5.2) | |
| 2. scattered dense areas | 124 (26.6) | 321 (34.4) | |
| 3. heterogeneously dense | 247 (53.0) | 482 (51.7) | |
| 4. extremely dense | 82 (17.6) | 81 (8.7) | |
| Quantra VBD percentage (median) | 18.41 (4.00∼66.90) | 15.97 (2.00∼60.00) | .020 |
| Quantra dense volume (median) | 117.63 (16.50∼502.50) | 95.73 (8.50∼333.00) | .000 |