Characteristic

Low-risk

Middle-risk

High-risk

Age

59.2 ± 8.8

59.4 ± 9.3

60.3 ± 10.6

Sex

Male

108

98

45

Female

171

118

35

Surgical procedure

Lobectomy

233

173

66

Sub-lobectomy

46

43

14

Tumor size, cm

<1 cm

84

35

18

≥1 cm

195

181

62

Predominant histologic subtype

Lepidic

157

35

13

Acinar

86

116

39

Papillary

31

44

14

Solid

5

19

12

MIP

0

2

2

CEA

<10 ng/ml

266

187

69

≥10 ng/ml

13

29

11