Table 1 Clinical characteristics of our study patients

Age (years, n = 100)

62.7±10.4

64.1±9.4

60.9±11.5

1.524

0.131

Sex (n=100)

8.431

0.004

 Male

48

35

13

 Female

52

23

29

CEA (ng/mL)

0.029

0.865

 <5

85

49

36

 ≥5

15

9

6

Clinical stage

11.101

0.004

 I

84

41

43

 II

16

15

1

 IIIA

8

4

4

Smoking status (n = 100)

0.004

0.948

 Never

55

30

22

 Former or current

45

28

20

Operation (n = 108)

10.196^a

0.006

 Lobectomy

72

45

27

 Segmentectomy

25

7

18

 Wedge resection

11

8

3