. Author manuscript; available in PMC: 2016 Jan 15.

Published in final edited form as: Clin Cancer Res. 2015 Jan 15;21(2):484–489. doi: 10.1158/1078-0432.CCR-14-1873

Table 3.

The demographic and clinical variables of an external testing set of patients with either malignant or benign SPNs

	76 Patients with malignant SPNs (stage I and II NSCLC)	79 Patients with benign SPNs
Age, Median (SD)	68.7 (9.2)	67.9 (SD 8.3)
Sex
Female	27 (35.5%)	26 (32.9%)
Male	49 (64.5%)	53 (67.1%)
Race
African American	22 (28.9%)	23 (29.1%)
White	54 (71.1%)	56 (70.9%)
Nodule size (cm)
Median (SD)	2.3 (1.7)	1.9 (1.5)
Range	0.4–4.5	0.2–4.0
Pack-years, Median (SD)	39.3 (SD 26.4)	32.7 (SD 31.3)
Stages
stage I	51 (67.1%)
stage II	25 (32.9%)
Histological types of NSCLC
AC	34 (44.7%)
SCC	35 (46.1%)
Others	7 (9.2%)

Abbreviations: SPNs, solitary pulmonary nodules; SD, standard deviation; NSCLC, non-small-cell lung cancer; AC, adenocarcinoma; SCC, squamous cell carcinoma.