Table 1.

Patient demographics and tumor stage for the training and testing samples

Training setValidation set
OverallLung cancer casesPatients with benign nodulesOverallLung cancer casesPatients with benign nodules
Demographics patients1024260702149
Nodules206841221022676
Age: median, mean (σ)67, 66.7 (8.6)69, 68.4 (8.7)65, 65.6 (8.3)65, 65.5 (9.3)69, 70.1 (7.4)64, 63.5 (9.5)
Gender n (%) (male/female)10295.2%/4.7%98%/1.6%7028.6%/0%67.1%/4.3%
 Male994059682047
 Female321303
Smoking: pack years median, mean (σ)46, 58.22 (42.15)50, 68 (53.53)51.365, 45 30.5693478145, 48.1 (37.5)57, 61.4 (34.4)40, 41.9 (37.5)
Race (Caucasian/African American/Native/others)92/9/0/135/7/0/057/2/0/163/2/2/321/0/0/042/2/2/3