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Table 1 Baseline characteristics of T1a 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 = 98)
Lobectomy with MLND (n = 215) p Lobectomy
(n = 82)
Lobectomy with MLND (n = 295) p
Mean ± SD Age (years) 63.55 ± 9.56 65.53 ± 8.83 0.08 64.51 ± 10.45 64.65 ± 9.08 0.91
Sex, no. (%)    0.09    0.15
male 46 (46.9) 79 (36.7)   36 (43.9) 104 (35.3)  
female 52 (53.1) 136 (63.3)   46 (56.1) 191 (64.7)  
Race, no. (%)    0.90    0.89
White 88 (89.8) 192 (89.3)   67 (81.7) 243 (82.4)  
Black/ Others 10 (10.2) 23 (10.7)   15 (18.3) 52 (17.6)  
Histology, no. (%)    0.67    0.22
Squamous cell carcinoma 30 (30.6) 71 (33.0)   15 (18.3) 73 (24.7)  
Adenocarcinoma 68 (69.4) 144 (67.0)   67 (81.7) 222 (75.3)  
Grade, no. (%)    0.18    0.71
I 16 (16.3) 42 (19.5)   24 (29.3) 91 (30.8)  
II 59 (60.2) 99 (46)   34 (41.5) 135 (45.8)  
III 19 (19.4) 59 (27.4)   22 (26.8) 59 (20.0)  
IV 0 1 (0.5)   0 1 (0.3)  
Unknown 4 (4.1) 14 (6.5)   2 (2.4) 9 (3.1)  
Primary site of tumor, no. (%)    0.86    0.71
Upper lobe 70 (71.4) 147 (68.4)   51 (62.2) 192 (65.1)  
Middle lobe 6 (6.1) 15 (7.0)   8 (9.8) 21 (7.1)  
Lower lobe 22 (22.4) 53 (24.7)   23 (28) 82 (27.8)  
Laterality, no. (%)    0.31    0.94
Left 39 (39.8) 72 (33.5)   29 (35.4) 103 (34.9)  
Right 59 (60.2) 143 (66.5)   53 (64.6) 192 (65.1)  
  1. SD Standard deviation
  2. T1a 0 < tumor size≤1 cm