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Table 2 Baseline characteristics of T1b 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 = 703)
Lobectomy with MLND (n = 1333) p Lobectomy
(n = 484)
Lobectomy with MLND (n = 1838) p
Mean ± SD Age (years) 66.94 ± 9.66 66.10 ± 9.71 0.06 66.98 ± 9.29 66.48 ± 9.23 0.28
Sex, no. (%)    0.39    0.24
male 312 (44.4) 565 (42.4)   222 (45.9) 788 (42.9)  
female 391 (55.6) 768 (57.6)   262 (54.1) 1050 (57.1)  
Race, no. (%)    0.99    0.70
White 613 (87.2) 1162 (87.2)   408 (84.3) 1536 (83.6)  
Black/ Others 90 (12.8) 171 (12.8)   76 (15.7) 302 (16.4)  
Histology, no. (%)    0.18    0.46
Squamous cell carcinoma 215 (30.6) 370 (27.8)   135 (27.9) 482 (26.2)  
Adenocarcinoma 488 (69.4) 963 (72.2)   349 (72.1) 1356 (73.8)  
Grade, no. (%)    0.62    0.47
I 103 (14.7) 177 (13.3)   85 (17.6) 370 (20.1)  
II 363 (51.6) 702 (52.7)   251 (51.9) 971 (52.8)  
III 210 (29.9) 417 (31.3)   130 (26.9) 444 (24.2)  
IV
Unknown
3 (0.4) 4 (0.3)   2 (0.4) 4 (0.2)  
24 (3.4) 33 (2.5)   16 (3.3) 49 (2.7)  
Primary site of tumor, no. (%)    0.01    0.31
Upper lobe 463 (65.9) 890 (66.8)   308 (63.6) 1198 (65.2)  
Middle lobe 62 (8.8) 66 (5.0)   33 (6.8) 93 (5.1)  
Lower lobe 178 (25.3) 377 (28.3)   143 (29.5) 547 (29.8)  
Laterality, no. (%)    0.50    0.38
Left 283 (40.3) 516 (38.7)   195 (40.3) 700 (38.1)  
Right 420 (59.7) 817 (61.3)   289 (59.7) 1138 (61.9)  
  1. SD Standard deviation
  2. T1b 1 cm < tumor size≤2 cm