Table 1 Patient information and characteristics of pulmonary nodules

Patient information

Patients without nodule

Patients with nodules

No. of men

50

114

No. of women

50

86

Mean age

46.51 ± 14.66

60.09 ± 13.23

Number of nodules per chest radiograph

 One nodule

188

 Two nodules

8

 Three nodules

4

Characteristics of pulmonary nodules

Non-danger zone nodules (n = 107)

Danger zone nodules (n = 109)

p-value

Size (cm)

15.81 ± 6.22

18.12 ± 5.61

0.005*

 ≤ 2.0

80

68

 2.1 - 3.0

27

41

Nodule solidity

0.148

 Solid

89

98

 Subsolid

18

11

 Part-solid

15

11

 Nonsolid

3

0

Disease entity

0.700

 Malignant

67

71

 Benign

40

38

Lobar distribution

0.088

 Right upper

29

29

 Right middle

10

3

 Right lower

19

28

 Left upper

29

21

 Left lower

20

28

Visibility score

< 0.001*

 1

6

6

 2

22

24

 3

31

59

 4

48

20

Location of danger zone nodules

 Apical lung zone

33

 Paramediastinal

59

 Retrodiaphragmatic

17