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Distribution of age and breast composition for 77,950 mammographic examinations.
| CHARACTERISTIC | NUMBER OF EXAMINATIONS |
|---|---|
| Age (years) | |
| < = 45 | 14,355 (18.4%) |
| 46–50 | 11,792 (15.1%) |
| 51–55 | 12,918 (16.6%) |
| 56–60 | 12,573 (16.1%) |
| 61–65 | 10,021 (12.9%) |
| >65 | 16,291 (20.9%) |
| Breast composition | |
| Predominantly fatty | 7,945 (10.1%) |
| Scattered fibroglandular densities | 35,207 (45.2%) |
| Heterogeneously dense | 29,680 (38.1%) |
| Extremely dense | 5,037 (6.5%) |
| Missing | 81 (0.1%) |
