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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)

From: Grading variation in 2,934 patients with ductal carcinoma in situ of the breast: the effect of laboratory- and pathologist-specific feedback reports

 Total (n = 2954)PRE (n = 1493)POST (n = 1461)p-valueb
Histologic grade, n (%)
 Grade 1383 (13.0%)169 (11.3%)214 (14.6%)0.016
 Grade 21171 (39.6%)590 (39.5%)581 (39.8%) 
 Grade 31400 (47.4%)734 (49.2%)666 (45.6%) 
Age (y)a59.8 (10.3)59.8 (10.5)59.8 (10.1)0.922
Sex, n (%)   0.790
 Female2943 (99.6%)1487 (99.6%)1456 (99.7%) 
 Male11 (0.4%)6 (0.4%)5 (0.3%) 
Tumor size (cm)a2.5 (2.3)2.5 (2.3)2.5 (2.3)0.321
Type of surgery, n (%)   0.096
 Mastectomy944 (32.0%)456 (30.5%)488 (33.4%) 
 Breast conserving2010 (68.0%)1037 (69.5%)973 (66.6%) 
  1. a Mean (SD)
  2. b PRE vs POST categorical variables by Chi-square test, continuous variables by Mann Whitney U Test