Table 2 Associations of mammographic breast density with demographic and clinical variables
Characteristic | Low (N = 69, 15%) | Moderate (N = 231, 49%) | High (N = 170, 36%) | Total (N = 470) | p-valuea | Multivariate p-valueb |
|---|---|---|---|---|---|---|
Age at Benign Biopsy | <0.001 | 0.001 | ||||
  < 45 | 7 (10.1%) | 15 (6.5%) | 32 (18.8%) | 54 (11.5%) |  |  |
 45-55 | 9 (13.0%) | 76 (32.9%) | 67 (39.4%) | 152 (32.3%) |  |  |
 55+ | 53 (76.8%) | 140 (60.6%) | 71 (41.8%) | 264 (56.2%) |  |  |
Type of Density Measure | <0.001 | <0.001 | ||||
 BI-RADS | 9 (13.0%) | 140 (60.6%) | 39 (22.9%) | 188 (40.0%) |  |  |
 PPAT | 60 (87.0%) | 91 (39.4%) | 131 (77.1%) | 282 (60.0%) |  |  |
Number of Atypical Foci | 0.31 | Â | ||||
 1 | 47 (68.1%) | 126 (54.5%) | 96 (56.5%) | 269 (57.2%) |  |  |
 2 | 15 (21.7%) | 61 (26.4%) | 42 (24.7%) | 118 (25.1%) |  |  |
 3+ | 7 (10.1%) | 44 (19.0%) | 32 (18.8%) | 83 (17.7%) |  |  |
Type of Atypia | 0.004 | 0.11 | ||||
 ADH | 41 (59.4%) | 116 (50.2%) | 65 (38.2%) | 222 (47.2%) |  |  |
 ALH | 27 (39.1%) | 96 (41.6%) | 96 (56.5%) | 219 (46.6%) |  |  |
 ADH and ALH | 1 (1.4%) | 19 (8.2%) | 9 (5.3%) | 29 (6.2%) |  |  |
Involution | <0.001 | 0.03 | ||||
 Missing | 2 | 11 | 7 | 20 |  |  |
 None | 1 (1.5%) | 19 (8.6%) | 26 (16.0%) | 46 (10.2%) |  |  |
 Partial | 41 (61.2%) | 124 (56.4%) | 112 (68.7%) | 277 (61.6%) |  |  |
 Complete | 25 (37.3%) | 77 (35.0%) | 25 (15.3%) | 127 (28.2%) |  |  |
BMI | <0.001 | <0.001 | ||||
 Missing | 1 | 2 | 2 | 5 |  |  |
  < 25 | 25 (36.8%) | 78 (34.1%) | 101 (60.1%) | 204 (43.9%) |  |  |
 25-29 | 19 (27.9%) | 70 (30.6%) | 35 (20.8%) | 124 (26.7%) |  |  |
 30+ | 24 (35.3%) | 81 (35.4%) | 32 (19.0%) | 137 (29.5%) |  |  |