Table 2. all samples ' characteristics of microarray data sets used in both training and validation stage.
| Training | Validation | |||
|---|---|---|---|---|
| Cancer (236) | Healthy (136) | Cancer (88) | Healthy (39) | |
| Sex | ||||
| Male | 136 | 87 | 57 | 22 |
| Female | 100 | 49 | 31 | 17 |
| Age, yr | ||||
| Median | 67 | 63 | 67 | 58 |
| SD | 8.26 | 10.24 | 8.12 | 10.94 |
| Range | 46 - 72 | 30 - 70 | 43 - 71 | 38 - 64 |
| Smoking history, pack-years | ||||
| Median | 32 | 51 | 45 | 33 |
| SD | 22.1 | 23.8 | 25.8 | 32.2 |
| Range | 3 - 77 | 5 - 56 | 1 - 76 | 5 - 65 |
| Tumor subtype | ||||
| Adenocarcinoma | 98 | 58 | ||
| Squamous | 138 | 30 | ||
| Tumor stage | ||||
| Stage I | 130 | 49 | ||
| Stage II | 106 | 39 | ||