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Table 1 Clinicopathological features of the unmatched and propensity scored-matched patients

From: Preoperative serum C-reactive protein levels and postoperative survival in patients with esophageal squamous cell carcinoma: a propensity score matching analysis

  Unmatched Matched
Low CRP(n = 711) High CRP(n = 250) P-value Low CRP(n = 176) High CRP(n = 176) P-value
Gender
 Male 546 (76.7%) 203 (81.2%) 0.137 136 (77.3%) 141 (80.1%) 0.517
 Female 165 (23.3%) 47 (18.8%)   40 (22.7%) 35 (19.9%)
Age, y 58 (49,65) 60 (50,70) 0.001 60 (57–63) 60 (57–63) 0.735
Smoking
 Yes 455 (64%) 173 (69.2%) 0.137 112 (63.6%) 121 (68.7%) 0.312
 No 256 (36%) 77 (30.8%)   64 (36.4%) 55 (31.3%)
Drinking
 Yes 238 (33.5%) 95 (38.2%) 0.182 62 (35.2%) 70 (39.4%) 0.417
 No 473 (66.5%) 155 (61.8%)   114 (64.8%) 106 (60.6%)
Tumor site
 Cervix 17 (2.4%) 1 (0.4%)   6 (3.4%) 1 (0.6%) 0.777
 Up 104 (14,6%) 40 (16.0%) 0.635 22 (12.5%) 31 (17.7%)
 Middle 350 (49.3%) 123 (49.2%)   94 (53.4%) 83 (47.4%)
 Low 240 (33.7%) 86 (34.4%)   54 (30.7%) 60 (34.2%)
TNM stage
 IA 6 (0.8%) 3 (1.2%)   3 (1.7%) 0 0.970
 IB 94 (13.2%) 17 (6.8%)   13 (7.4%) 18 (10.2%)
 IIA 117 (16.5%) 44 (17.6%) 0.254 30 (17.0%) 32 (18.2%)
 IIB 194 (27.3%) 69 (27.6%)   44 (25.0) 42 (23.9%)
 IIIA 158 (22.2%) 68 (27.2%)   47 (26.7%) 44 (25.0%)
 IIIB 83 (11.7%) 35 (14%)   26 (14.8%) 23 (13.1%)
 IIIC 59 (8.3%) 14 (5.6%)   13 (7.4%) 17 (9.7%)
Differentiation
 Well 192 (27%) 86 (34.4%)   57 (32.4%) 63 (35.3%) 0.823
 Moderate 404 (56.8%) 120 (48.0%) 0.086 85 (48.3%) 78 (44.3%)
 Poor 115 (16.2%) 44 (17.6%)   34 (19.3%) 36 (20.5%)
Surgical incision
 Left 434 (61.0%) 165 (66.0%) 0.176 105 (59.7%) 117 (66.5%) 0.199
 Right 277 (39.0%) 85 (34.0%)   71 (40.3%) 59 (33.5%)
  1. Abbreviations: CRP C-reactive protein