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Table 3 Baseline characteristics of T1c NSCLC patients who were diagnosed in 2003–2013

From: Time trend of mediastinal lymph node dissection in stage IA non-small cell lung cancer patient who undergo lobectomy: a retrospective study of surveillance, epidemiology, and end results (SEER) database

Variables Period between 2003 and 2008 Period between 2009 and 2013
Lobectomy
(n = 563)
Lobectomy with MLND (n = 1158) p Lobectomy
(n = 363)
Lobectomy with MLND (n = 1499) p
Mean ± SD Age (years) 67.60 ± 9.76 68.31 ± 9.32 0.14 67.94 ± 9.55 68.13 ± 9.06 0.71
Sex, no. (%)    0.14    0.82
male 295 (52.4) 563 (48.6)   169 (46.6) 708 (47.2)  
female 268 (47.6) 595 (51.4)   194 (53.4) 791 (52.8)  
Race, no. (%)    0.93    0.49
White 489 (86.9) 1004 (86.7)   297 (81.8) 1249 (83.3)  
Black/ Others 74 (13.1) 154 (13.3)   66 (18.2) 250 (16.7)  
Histology, no. (%)    0.82    0.62
Squamous cell carcinoma
Adenocarcinoma
199 (35.3) 416 (35.9)   127 (35.0) 504 (33.6)  
364 (64.7) 742 (64.1)   236 (65.0) 995 (66.4)  
Grade, no. (%)    0.44    0.86
I 54 (9.6) 131 (11.3)   52 (14.3) 239 (15.9)  
II 274 (48.7) 554 (47.8)   186 (51.2) 749 (50.0)  
III 216 (38.4) 434 (37.5)   117 (32.2) 467 (31.2)  
IV 2 (0.4) 11 (0.9)   1 (0.3) 6 (0.4)  
Unknown 17 (3.0) 28 (2.4)   7 (1.9) 38 (2.5)  
Primary site of tumor, no. (%)    0.01    0.07
Upper lobe 353 (62.7) 764 (66.0)   214 (59.0) 978 (65.2)  
Middle lobe 37 (6.6) 40 (3.5)   18 (5.0) 55 (3.7)  
Lower lobe 173 (30.7) 354 (30.6)   131 (35.1) 466 (31.1)  
Laterality, no. (%)    0.11    0.54
Left 219 (38.9) 498 (43.0)   159 (43.8) 630 (42.0)  
Right 344 (61.1) 660 (57.0)   204 (56.2) 869 (58.0)  
  1. SD Standard deviation
  2. T1c 2 < tumor size≤3 cm