Table 1 Characteristics of the 2954 included ductal carcinoma in situ (DCIS) lesions from the PALGA database between March 1, 2017 and March 1, 2018 (PRE feedback), and March 1, 2018 to March 1, 2019 (POST feedback)
|  | Total (n = 2954) | PRE (n = 1493) | POST (n = 1461) | p-valueb |
|---|---|---|---|---|
Histologic grade, n (%) | ||||
 Grade 1 | 383 (13.0%) | 169 (11.3%) | 214 (14.6%) | 0.016 |
 Grade 2 | 1171 (39.6%) | 590 (39.5%) | 581 (39.8%) |  |
 Grade 3 | 1400 (47.4%) | 734 (49.2%) | 666 (45.6%) |  |
Age (y)a | 59.8 (10.3) | 59.8 (10.5) | 59.8 (10.1) | 0.922 |
Sex, n (%) | Â | Â | Â | 0.790 |
 Female | 2943 (99.6%) | 1487 (99.6%) | 1456 (99.7%) |  |
 Male | 11 (0.4%) | 6 (0.4%) | 5 (0.3%) |  |
Tumor size (cm)a | 2.5 (2.3) | 2.5 (2.3) | 2.5 (2.3) | 0.321 |
Type of surgery, n (%) | Â | Â | Â | 0.096 |
 Mastectomy | 944 (32.0%) | 456 (30.5%) | 488 (33.4%) |  |
 Breast conserving | 2010 (68.0%) | 1037 (69.5%) | 973 (66.6%) |  |