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Table 2 Clinical characteristic of esophageal squamous cell carcinoma patients with stage T1–3N0M0 from SEER database

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

  All patients
(N = 151)
NELNs  
≤15 (N = 98) > 15 (N = 53)
Variables   P value
 Sex, n (%)     0.853*
  Male 87 (57.6%) 57 (58.2%) 30 (56.6%)
  Female 64 (42.4%) 41 (41.8%) 23 (43.4%)
 Race, n (%)     0.001***
  White patients 104 (68.9%) 69 (70.4%) 35 (66.0%)
  Black patients 26 (17.2%) 22 (22.4%) 4 (7.6%)
  Other patients 21 (13.9%) 7 (7.2%) 14 (26.4%)  
 Age (year), n (%)     0.155*
   ≤ 60 42 (27.8%) 31 (31.6%) 11 (20.8%)
   > 60 109 (72.2%) 67 (68.4%) 42 (79.2%)
 Tumor differentiation, n (%)     0.325*
  Well 20 (13.2%) 10 (10.2%) 10 (18.9%)  
  Moderate 82 (54.3%) 55 (56.1%) 27 (50.9%)  
  Poor 49 (32.5%) 33 (33.7%) 16 (30.2%)  
 pT stage, n (%)     0.126*
  T1 61 (40.4%) 40 (40.8%) 21 (39.6%)
  T2 30 (19.9%) 15 (15.3%) 15 (28.3%)
  T3 60 (39.7%) 43 (43.9%) 17 (32.1%)
 Tumor location, n (%)     0.129***
  Upper 15 (9.9%) 13 (13.3%) 2 (3.8%)
  Middle 75 (49.7%) 49 (50.0%) 26 (49.1%)
  Lower 61 (40.4%) 36 (36.7%) 25 (47.1%)
 Tumor length (cm)     
  Median (interquartile range) 3.0 (2.6) 3.5 (2.5) 2.5 (2.5) 0.121**
  1. SEER Surveillance Epidemiology and End Results, NELN the number of examined lymph node; *: chi-squared test; **: Mann-Whitney U test; ***: Fisher exact test