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Table 4 Patients’ characteristics before and after Propensity Score Matching

From: Role of postoperative radiotherapy in dermatofibrosarcoma protuberans: a propensity score-matched analysis

Characteristics Before Matching After Matching
S   S + RT   P S   S + RT   P
n = 140 % n = 44 % n = 32 % n = 32 %
Gender      0.315      0.396
 Male 109 77.9 31 70.5   25 78.1 22 68.8  
 Female 31 22.1 13 29.5   7 21.9 10 31.3  
Presentation      0.949      1.000
 Primary 93 66.4 29 65.9   21 65.6 21 65.6  
 Recurrent 47 33.6 15 34.1   11 34.4 11 34.4  
Age, years      0.234      1.000
 <  50 95 67.9 34 77.3   24 75.0 24 75.0  
 ≥ 50 45 32.1 10 22.7   8 25.0 8 25.0  
Site      0.214      0.815
 Trunk 100 71.4 32 72.7   24 75.0 24 75.0  
 Extremities 18 12.9 2 4.6   2 6.2 1 3.1  
 Head and neck 22 15.7 10 22.7   6 18.8 7 21.9  
Tumor size, cm      0.397      0.784
 <  5 99 70.7 34 77.3   22 68.8 23 71.9  
 ≥ 5 41 29.3 10 22.7   10 31.2 9 28.1  
Lesion number      0.455      0.301
 1 129 92.1 42 95.5   29 90.6 31 96 .9  
 ≥ 2 11 7.9 2 4.5   3 9.4 1 3.1  
Margin status      < 0.001      0.391
 Negative 126 90.0 27 61.4   30 93.8 28 87.5  
 Positive 14 10.0 17 38.6   2 6.2 4 12.5  
Margin width, cm      < 0.001      0.617
 <  2 19 13.6 28 63.6   15 46.9 17 53.1  
 ≥ 2 121 86.4 16 36.4   17 53.1 15 46.9  
Histological      0.183      0.586
 Ordinary 124 87.9 37 84.1   28 88.6 30 82.8  
 Fibrosarcoma 13 9.3 3 6.8   3 8.6 1 8.6  
 Myxoid 3 2.1 4 9.1   1 2.9 1 8.6  
  1. S surgery, RT radiotherapy