Table 1.
Patient clinicodemographic features (presented at the scan level).
| Characteristic | Training | Test | Overall |
|---|---|---|---|
| Age (mean, SD) | 69.02 (10.47) | 69.23 (9.65) | 69.08 (10.23) |
| Gender (n, %) | |||
| Male | 280 (47.8) | 131 (52.0) | 411 (49.0) |
| Female | 306 (52.2) | 121 (48.0) | 427 (51.0) |
| Nodule size (mean, SD) | 20.35 (4.56) | 20.87 (4.99) | 20.51 (4.70) |
| Nodule density (n, %) | |||
| Solid | 418 (71.3) | 174 (69.0) | 592 (70.6) |
| Sub-solid | 126 (21.5) | 65 (25.8) | 191 (22.8) |
| GGO | 42 (7.2) | 13 (5.2) | 55 (6.6) |
| Spiculation (n, %) | |||
| Yes | 120 (20.5) | 80 (31.7) | 200 (23.9) |
| No | 466 (79.5) | 172 (68.3) | 638 (76.1) |
| Malignancy (n, %) | |||
| Yes | 366 (62.5) | 158 (62.7) | 524 (62.5) |
| No | 220 (37.5) | 94 (37.3) | 314 (37.5) |
| PET avidity (n, %) | |||
| Absent | 35 (6.0) | 18 (7.1) | 53 (6.3) |
| Faint | 116 (19.8) | 33 (13.1) | 149 (17.8) |
| Moderate | 146 (24.9) | 63 (25.0) | 209 (24.9) |
| Intense | 95 (16.2) | 60 (23.8) | 155 (18.5) |
| Not recorded | 194 (33.1) | 78 (37.0) | 272 (32.5) |
| Smoking (n, %) | |||
| Never | 94 (16.0) | 22 (8.7) | 116 (13.8) |
| Ex/Current | 403 (68.8) | 181 (71.8) | 584 (69.7) |
| Unknown | 89 (15.2) | 49 (9.5) | 138 (16.5) |
| Lung disease (n, %) | |||
| Yes | 323 (55.1) | 146 (57.9) | 469 (56.0) |
| No | 263 (44.9) | 106 (42.1) | 369 (44.0) |
| Previous lung ca (n, %) | |||
| Yes | 25 (4.3) | 7 (2.8) | 32 (3.8) |
| No | 561 (95.7) | 245 (97.2) | 806 (96.2) |
| FH of lung ca (n, %) | |||
| Yes | 7 (1.2) | 3 (1.2) | 10 (1.2) |
| No | 579 (98.8) | 249 (98.8) | 828 (98.8) |
| Previous non-lung ca (n, %) | |||
| Yes | 131 (22.4) | 60 (23.8) | 191 (22.8) |
| No | 455 (77.6) | 192 (76.2) | 647 (77.2) |
Abbreviations: SD, Standard Deviation, GGO, ground-glass opacity, ca,cancer.