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Table 1 Demographic and clinical characteristics of subjects (N = 2711)

From: Survival analysis of patients with non-small cell lung cancer who underwent surgical resection following 4 lung cancer resection guidelines

Age (y) 59.6 ± 9.6
Gender  
 Male 1803 (66.5)
 Female 908 (33.5)
Smoking history  
 Smoker 1722 (63.5)
 Never 989 (36.5)
Surgical procedure  
 Segmentectomy 65 (2.4)
 Lobectomy 2254 (83.1)
 Pneumonectomy 373 (13.8)
 Extended 19 (0.7)
Surgical margin status  
 Positive 130 (4.8)
 Negative 2581 (95.2)
Histology  
 Squamous 1365 (50.4)
 Adenocarcinoma 924 (34.1)
 Large cell 33 (1.2)
 Adenosquamous 159 (5.9)
 Other 230 (8.5)
T stage  
 T1/T2 2354 (86.8)
 T3/T4 357 (13.2)
N stage  
 N0 1544 (57.0)
 N1/N2 1167 (43.0)
AJCC TNM Stage  
 IA 558 (20.6)
 IB 589 (21.7)
 II A 444 (16.4)
 IIB 229 (8.4)
 III 891 (32.9)
Lymph node stations examined  
 < 6 group 1040 (38.4)
 ≥ 6 group 1671 (61.6)
Number of lymph nodes removed  
 < 10 689 (25.4)
 10-20 943 (34.8)
 ≥ 20 1079 (39.8)
Adjuvant chemotherapy  
 Yes 1333 (49.2)
 No 1378 (50.8)
Radiotherapy  
 Yes 427 (15.8)
 No 2284 (84.2)
Immunotherapy  
 Yes 224 (8.3)
 No 2487 (91.7)
  1. Data are presented as mean ± standard deviation (SD) or number (percentage).
  2. *1151 patients were classified into stage I, 669 in stage II, and 891 in stage III.