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Table 1 Baseline data before and after propensity score matching

From: Isoperistaltic versus antiperistaltic uncut Roux-en-Y anastomosis after distal gastrectomy for gastric cancer: a propensity score matched analysis

Characteristics Before matching After matching
ANTI (n = 220) ISO (n = 392) P ANTI (n = 183) ISO (n = 183) P
n % n % n % n %
Sex
 Male 139 63.2 243 62.0 0.77 116 63.4 114 62.3 0.829
 Female 81 36.8 149 38.0   67 36.6 69 37.7  
Age (mean ± SD, year) 63.3 ± 8.6 65.6 ± 8.4   64.3 ± 8.7 64.9 ± 8.5 0.563
BMI (mean ± SD, kg/m2) 24.9 ± 4.4 25.2 ± 4.3   24.5 ± 4.3 24.8 ± 4.5 0.623
Year of surgery
 2016 43 19.6 118 30.1 0.011 28 15.3 34 18.6 0.326
 2017 92 41.8 155 39.5   67 36.6 75 41.0  
 2018 85 38.6 119 30.4   88 48.1 74 40.4  
ASA score
 I 70 31.8 90 23.0 0.045 49 26.8 50 27.3 0.992
 II 109 49.5 210 53.6   98 53.6 97 53.0  
 III 41 18.6 92 23.5   36 19.7 36 19.7  
Area
 Urban 95 43.2 206 52.6 0.026 86 47.0 85 46.4 0.917
 Rural 125 56.8 186 47.4   97 53.0 98 53.6  
Education (years)
 < 12 41 18.6 99 25.3 0.061 39 21.3 37 20.2 0.797
 ≥ 12 179 81.4 293 74.7   144 78.7 146 79.8  
History of abdominal surgery
 Yes 120 54.5 198 50.5 0.338 107 58.5 105 57.4 0.832
 No 100 45.5 194 49.5   76 41.5 78 42.6  
History of diabetes
 Yes 83 37.7 132 33.7 0.313 75 41.0 70 38.9 0.686
 No 137 62.3 260 66.3   108 59.0 113 61.1  
History of smoking
 Yes 83 37.7 168 42.9 0.216 53 29.0 59 32.2 0.496
 No 137 62.3 224 57.1   130 71.0 124 67.8  
Tumor location
 Gastric body 79 35.9 99 25.3 0.020 56 26.8 44 24.0 0.331
 Between 96 43.6 197 50.3   92 53.6 97 53.0  
 Pyloric canal 45 20.5 96 24.5   35 19.7 42 23.0  
Tumor size (cm)
 < 4 123 57.7 259 66.1 0.040 108 59.0 98 53.6 0.292
 ≥ 4 97 42.3 133 33.9   75 41.0 85 46.4  
Preoperative chemotherapy
 Yes 21 9.5 22 5.6 0.068 14 92.3 15 92.4 0.847
 No 199 90.5 370 94.4   169 7.7 168 7.6  
Clinical T factor
 T1 58 26.4 73 18.6 0.009 41 22.4 42 23.0 0.342
 T2 46 20.9 99 25.3   44 24.0 31 16.9  
 T3 52 23.6 130 33.2   43 23.5 53 29.0  
 T4 64 29.1 90 23.0   55 30.1 57 31.1  
Clinical N factor
 N0 101 45.9 219 55.9 0.018 80 43.7 92 50.3 0.209
 N1–3 119 54.1 173 44.1   103 56.3 91 49.7  
  1. ANTI antiperistaltic uncut Roux-en-Y anastomosis, ISO Isoperistaltic uncut Roux-en-Y anastomosis