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Table 1 Clinical characteristics before and after PSM according to CRT or not

From: Impact of chemotherapy and radiotherapy on the survival of elderly esophageal cancer patients undergoing surgery: a SEER database analysis

Variables Before matching Pa value After matching P value
CRT N = 534 (%) Non-CRT N = 551 (%) CRT N = 277 (%) Non-CRT N = 277 (%)
Sex    0.2    0.84
 Male 443 (82.96%) 426 (77.31%)   212 (76.53%) 214 (77.26%)  
 Female 91 (17.04%) 125 (22.69%)   65 (23.47%) 63 (22.74%)  
Race    0.372    0.659
 White 498 (93.26%) 506 (91.83%)   250 (90.25%) 253 (91.34%)  
 Other racesb 36 (6.74%) 45 (8.17%)   27 (9.75%) 24 (8.66%)  
Marriage    0.004    0.154
 Married 386 (72.28%) 354 (64.25%)   188 (67.87%) 172 (62.09%)  
 Unmarried 148 (27.72%) 197 (35.75%)   89 (32.13%) 105 (37.91%)  
Location    0.225    0.31
 Upper third 10 (1.87%) 15 (2.72%)   8 (2.89%) 10 (3.61%)  
 Middle third 82 (15.36%) 102 (18.51%)   62 (22.38%) 48 (17.33%)  
 Low third 442 (82.77%) 434 (78.77%)   207 (74.73%) 219 (79.06%)  
Histology    0.154    0.089
 SCC 106 (19.85%) 129 (23.41%)   87 (31.41%) 69 (24.91%)  
 Adenocarcinoma 428 (80.15%) 422 (76.59%)   190 (68.59%) 208 (75.09%)  
Gradec    0.009    0.173
 I + II 278 (52.06%) 330 (59.89%)   153 (55.23%) 137 (49.46%)  
 III + IV 256 (47.94%) 221 (40.11%)   124 (44.77%) 140 (50.54%)  
Size    0    0.341
 < 33 mm 354 (66.29%) 196 (35.57%)   171 (61.73%) 160 (57.76%)  
 ≥ 33 mm 180 (33.71%) 355 (64.43%)   106 (38.27%) 117 (42.24%)  
T stage    0    0.08
 T1 59 (11.05%) 298 (54.08%)   57 (20.58%) 63 (22.74%)  
 T2 91 (17.04%) 80 (14.52%)   64 (23.1%) 48 (17.33%)  
 T3 347 (64.98%) 160 (29.04%)   133 (48.01%) 153 (55.23%)  
 T4 37 (6.93%) 13 (2.36%)   23 (8.3%) 13 (4.69%)  
Lymph node    0    0.932
 Positive 371 (69.48%) 404 (73.32%)   138 (49.82%) 139 (50.18%)  
 Negative 163 (30.52%) 147 (26.68%)   139 (50.18%) 138 (49.82%)  
Metastasis    0.173    0.6
 Yes 25 (4.68%) 17 (3.09%)   19 (6.86%) 16 (5.78%)  
 No 509 (95.32%) 534 (96.91%)   258 (93.14%) 261 (94.22%)  
  1. CRT chemo- and radio-therapy, SCC squamous cell carcinoma
  2. aThe P values of comparing CRT and non-CRT calculated by the using χ2 test
  3. bOther races: Black, American Indian/Alaska Native, Asian/Pacific Islander
  4. cI: well differentiation; II: moderate differentiation; III: poor differentiation; IV: undifferentiation