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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