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Table 1 Baseline characteristics of the two treatment cohorts before and after propensity score matching

From: Omission of adjuvant radiotherapy following breast-conserving surgery for elderly women with early-stage pure mucinous breast carcinoma

Variables Before PSM After PSM
n Non-RT (%) RT (%) P n Non-RT (%) RT (%) P
Age (years)
 65–69 681 123 (10.0) 558 (25.5) < 0.001 244 122 (12.1) 122 (12.1) 1
 70–74 840 210 (17.1) 630 (28.8)   420 210 (20.8) 210 (20.8)  
 75–79 803 251 (20.5) 552 (25.2)   490 245 (24.3) 245 (24.3)  
  > 79 1092 641 (52.3) 451 (20.6)   866 433 (42.9) 433 (42.9)  
Race/ethnicity
 Non-Hispanic White 2829 1035 (84.5) 1794 (81.9) 0.039 1694 847 (83.9) 847 (83.9) 1
 Non-Hispanic Black 214 76 (6.2) 138 (6.3)   116 58 (5.7) 58 (5.7)  
 Hispanic (All Races) 199 69 (5.6) 130 (5.9)   122 61 (6.0) 61 (6.0)  
 Other 174 45 (3.7) 128 (5.9)   88 44 (4.4) 44 (4.4)  
Grade
 Well-differentiated 2279 837 (68.3) 1442 (65.8) 0.314 1358 679 (67.2) 679 (67.2) 1
 Moderately differentiated 1047 356 (29.1) 691 (31.5)   622 311 (30.8) 311 (30.8)  
 Poorly differentiated/undifferentiated 90 32 (2.6) 58 (2.6)   40 20 (2.0) 20 (2.0)  
Tumor stage
 T1 2848 1000 (81.6) 1848 (84.3) 0.041 1672 836 (82.8) 836 (82.8) 1
 T2 568 225 (18.4) 343 (15.7)   348 174 (17.2) 174 (17.2)  
Chemotherapy
 No/unknown 3343 1213 (99.0) 2130 (97.2) < 0.001 2000 1000 (99.0) 1000 (99.0) 1
 Yes 73 12 (1.0) 61 (2.8)   20 10 (1.0) 10 (1.0)  
  1. PSM propensity score matching; RT radiotherapy