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Table 1 Clinicopathological characteristic of patients from Sun Yat-sen University Cancer Center database before and after propensity score matching

From: Postoperative survival effect of the number of examined lymph nodes on esophageal squamous cell carcinoma with pathological stage T1–3N0M0

  Entire cohort (N = 707)   Matched cohort (N = 462)  
NELNs ≤15
(N = 352)
NELNs > 15
(N = 355)
NELNs ≤15
(N = 231)
NELNs > 15
(N = 231)
Variables    P value    P value
 Sex, n (%)    0.360*    0.212*
  Male 251 (71.3%) 264 (74.4%) 173 (74.9%) 161 (69.7%)  
  Female 101 (28.7%) 91 (25.6%) 58 (25.1%) 70 (30.3%)  
 Drinking history, n (%)    0.001*    0.761*
  No 271 (77.0%) 235 (66.2%) 163 (70.6%) 160 (69.3%)  
  Yes 81 (23.0%) 120 (33.8%) 68 (29.4%) 71 (30.7%)  
 Smoking history, n (%)    0.004*    0.774*
  No 152 (43.2%) 116 (32.7%)   87 (37.7%) 90 (39.0%)  
  Yes 200 (56.8%) 239 (67.3%)   144 (62.3%) 141 (61.0%)  
 Tumor differentiation, n (%)    0.373*    0.318*
  Well 84 (23.9%) 96 (27.0%)   54 (23.4%) 60 (26.0%)  
  Moderate 192 (54.5%) 175 (49.3%)   126 (54.5%) 110 (47.6%)  
  Poor 76 (21.6%) 84 (23.7%)   51 (22.1%) 61 (26.4%)  
 pT stage, n (%)    0.033*    0.955*
  T1 60 (17.0%) 47 (13.2%) 35 (15.2%) 37 (16.0%)  
  T2 107 (30.4%) 87 (24.5%) 56 (24.2%) 54 (23.4%)  
  T3 185 (52.6%) 221 (62.3%) 140 (60.6%) 140 (60.6%)  
 Surgical approaches, n (%)    < 0.001*    0.095**
  Sweet 287 (81.5%) 194 (54.6%)   178 (77.1%) 179 (77.5%)  
  Ivor-Lewis 15 (4.3%) 9 (2.5%)   10 (4.3%) 9 (3.9%)  
  McKeown 37 (10.5%) 145 (40.8%)   33 (14.3%) 41 (17.7%)  
  Other 13 (3.7%) 7 (2.1%)   10 (4.3%) 2 (0.9%)  
 Transthoracic laterality, n (%)    < 0.001**    0.735**
  Left 293 (83.2%) 196 (55.2%)   182 (78.8%) 179 (77.5%)  
  Right 57 (16.2%) 156 (43.9%)   48 (20.8%) 52 (22.5%)  
  Other 2 (0.6%) 3 (0.9%)   1 (0.4%) 0 (0.0%)  
 Two-field dissection, n (%)    0.093*    1.000*
  No 30 (8.5%) 44 (12.4%)   7 (3.0%) 8 (3.5%)  
  Yes 322 (91.5%) 311 (97.6%)   224 (97.0%) 223 (96.5%)  
 Three-field dissection, n (%)    < 0.001**    1.000**
  No 349 (99.1%) 316 (89.0%)   228 (98.7%) 227 (98.3%)  
  Yes 3 (0.9%) 39 (11.0%)   3 (1.3%) 4 (1.7%)  
 Tumor location, n (%)    0.647*    0.776*
  Upper 31 (8.8%) 36 (10.1%) 14 (6.1%) 12 (5.2%)  
  Middle 123 (34.9%) 131 (36.9%) 76 (32.9%) 83 (35.9%)  
  Lower 198 (56.3%) 188 (53.0%) 141 (61.0%) 136 (58.9%)  
 Age (year), n (%)    0.312*    0.453*
   ≤ 60 196 (55.7%) 211 (59.4%)   134 (58.0%) 126 (54.5%)  
   > 60 156 (44.3%) 144 (40.6%)   97 (42.0%) 105 (45.5%)  
 Median (interquartile range) 59 (14) 59 (12) 0.972*** 59 (15) 60 (12) 0.082***
 Tumor length (cm)    0.013**    0.705*
   ≤ 3 192 (55.2%) 162 (45.8%)   107 (46.9%) 112 (48.7%)  
   > 3 156 (44.8%) 192 (54.2%)   121 (53.1%) 118 (51.3%)  
 Median (interquartile range) 3.0 (2.0) 3.5 (2.5) 0.001*** 3.5 (2.0) 3.5 (2.5) 0.776***
  1. NELN the number of examined lymph node; *: chi-squared test; **: Fisher’s exact test; ***: Mann-Whitney U test
  2. There were 5 patients with missing data in tumor length