Table 1.
Characteristics of BIRADS 4 cohort, all ages, N = 464 a
| Characteristics | Data | |
|---|---|---|
| Age, yr, mean ± SD (range) | 48.7 ± 13.2 | (20 to 86) |
| Age, yr, categories | ||
| <35 | 73 | 15.7 |
| 35 to 40 | 41 | 8.8 |
| 40 to 49 | 114 | 24.6 |
| 50 to 59 | 146 | 31.5 |
| 60+ | 90 | 19.4 |
| Race/ethnicity | ||
| White | 277 | 59.7 |
| African American/black | 145 | 31.3 |
| Hispanic | 9 | 1.9 |
| Asian | 16 | 3.5 |
| Other | 17 | 3.7 |
| Age at menarche, yr | ||
| <11 | 90 | 19.4 |
| 12 to 13 | 200 | 43.1 |
| ≥14 | 107 | 23.1 |
| Unknown | 67 | 14.4 |
| Age at first live birth, yr | ||
| <20 | 69 | 14.9 |
| 20 to 24 | 94 | 20.3 |
| 25 to 29 | 76 | 16.4 |
| ≥30 | 80 | 17.2 |
| Nulliparous | 139 | 30 |
| Missing data | 6 | 1.3 |
| First-degree relatives with breast or ovarian cancer, n | ||
| 0 | 350 | 75.4 |
| 1 | 101 | 21.8 |
| >1 | 13 | 2.8 |
| Prior breast biopsy, n | ||
| 0 | 266 | 57.3 |
| 1 | 123 | 26.5 |
| >1 | 75 | 16.2 |
| Prior AH | ||
| Yes | 20 | 4.3 |
| No | 444 | 95.7 |
| Gail 5-yr risk estimate, mean ± SD | 1.54 ± 1.43 | |
| Gail 5-yr risk estimate, % | ||
| <1.67 | 309 | 66.6 |
| ≥1.67 | 155 | 33.4 |
| Body mass index, kg/m2 | ||
| <25 | 182 | 39.2 |
| 25 to 29.9 | 95 | 20.5 |
| ≥30 | 108 | 23.3 |
| Missing data | 79 | 17.0 |
| deCODE genetics panel RR, mean ± SD | 1.22 ± 0.44 | |
| <1.00 | 163 | 35.1 |
| 1.01 to 1.49 | 182 | 39.2 |
| ≥1.50 | 119 | 25.7 |
| Outcome of biopsy | ||
| Benign | 366 | 78.9 |
| AH/LCIS | 24 | 5.2 |
| DCIS | 33 | 7.1 |
| Invasive carcinoma | 41 | 8.8 |
aAH, Atypical hyperplasia; BI-RADS, Breast Imaging-Reporting and Data System; DCIS, Ductal carcinoma in situ; LCIS, Lobular carcinoma in situ; RR, Relative risk; SD, Standard deviation. Data are number and percent unless otherwise stated.