Table 1.
Characteristics of women undergoing screening mammography, Vermont 2001 to 2012
| Variable | Observed No. (%) |
|---|---|
| Total screening mammograms | 588429 (100) |
| Age, y | |
| 40–49 | 188183 (32.0) |
| 50–59 | 212611 (36.1) |
| 60–69 | 141994 (24.1) |
| 70–74 | 45641 (7.8) |
| Missing | 0 (0.0) |
| Mammographic breast density | |
| Almost entirely fat | 71649 (12.2) |
| Scattered fibroglandular densities | 228364 (38.8) |
| Heterogeneously dense | 164604 (28.0) |
| Extremely dense | 25483 (4.3) |
| Missing | 98329 (16.7) |
| First-degree family history | |
| No | 449556 (76.4) |
| Yes | 92161 (15.7) |
| Missing | 46712 (7.9) |
| Biopsy history | |
| No | 425461 (72.3) |
| Yes | 123182 (20.9) |
| Missing | 39786 (6.8) |
| Race/ethnicity | |
| White, non-Hispanic | 563025 (95.7) |
| Black, non-Hispanic | 1535 (0.3) |
| Asian | 3736 (0.6) |
| Hispanic | 9337 (1.6) |
| Missing | 10796 (1.8) |