Table 1.
Patient clinicodemographic information.
| Characteristic | Training | Test | External test |
|---|---|---|---|
| Age, mean (SD) | 64.62 (11.90) | 66.43 (9.49) | 68.72 (8.64) |
| Gender, No. (%) | |||
| Male | 285 (46.80) | 50 (39.37) | 111 (43.70) |
| Female | 324 (53.20) | 77 (60.63) | 143 (56.30) |
| Smoking, No. (%) | |||
| Y | 345 (58.87) | 84 (66.14) | 197 (77.56) |
| N | 241 (41.13) | 43 (33.86) | 57 (22.44) |
| Nodule diameter, Mean (SD), mm | 10.98 (3.30) | 11.64 (2.94) | 9.49 (2.49) |
| CT with contrast, No. (%) | |||
| Y | 348 (57.14) | 60 (47.24) | 92 (36.22) |
| N | 261 (42.86) | 67 (52.75) | 162 (63.78) |
| Malignancy, No. (%) | |||
| Y | 305 (50.08) | 72 (56.69) | 63 (24.80) |
| N | 304 (49.92) | 55 (43.31) | 191 (75.20) |
Characteristics are displayed at the nodule level. SD standard deviation. Smoking data were missing for 23 nodules.