Table 1 The demographic and clinical variables of a training set of patients with malignant SPNs, patients with benign SPNs, and healthy smokers

Age, Median (SD)

66.2 (8.3)

64.7 (12.9)

66.5 (7.1)

Sex

   Female

12 (37.5%)

13(39.4%)

10 (34.5%)

   Male

20 (62.5%)

20 (60.6%)

19 (65.5%)

Race

   African American

8 (25.0%)

9 (27.3%)

8 (27.6%)

   White

24 (75.0%)

24 (72.7%)

21 (72.4%)

Nodule size, Median (SD)

2.6 (1.8)

1.1 (1.7)

Pack-years, Median (SD)

35.5 (26.8)

30.0 (30.2)

35.0 (22.8)

Stages of NSCLC

   stage I

11 (34.4%)

   stage II

8 (25.0%)

   stage III-IV

13 (40.6%)

Histological types of NSCLC

   AC

18 (56.3%)

   SCC

14 (43.7%)

Diagnosis of benign SPNs

   Inflammatory lesion

27 (81.8%)

   Sarcoid

3 (9.1%)

   Granuloma

2 (6.1%)

   Fibrosis

1 (3.0%)