Table 1.
Clinical characteristics of the 875 patients with pulmonary nodules in the training cohort and validation cohort
| Training cohort (n = 612) | Validation cohort (n = 263) | ||||||
|---|---|---|---|---|---|---|---|
| Characteristic | Benign n (%) | Malignant n (%) | P value | Benign n (%) | Malignant n (%) | P value | |
| Age (years) | < 0.001 | 0.546 | |||||
| < 55 | 59 (52.2) | 137 (27.5) | 22 (39.3) | 70 (33.8) | |||
| ≥ 55 | 54 (47.8) | 362 (72.5) | 34 (60.7) | 137 (66.2) | |||
| Gender | 0.113 | 0.537 | |||||
| Female | 60 (53.1) | 308 (61.7) | 32 (57.1) | 130 (62.8) | |||
| Male | 53 (46.9) | 191 (38.3) | 24 (42.9) | 77 (37.2) | |||
| Location of pulmonary nodule | 0.030 | 0.506 | |||||
| In lung | Right upper | 32 (28.3) | 190 (38.1) | 12 (21.4) | 65 (31.4) | ||
| Right middle | 10 (8.8) | 37 (7.4) | 5 (8.9) | 22 (10.6) | |||
| Right lower | 30 (26.5) | 85 (17.0) | 10 (17.9) | 35 (16.9) | |||
| Left upper | 18 (15.9) | 112 (22.4) | 15 (26.8) | 50 (24.2) | |||
| Left lower | 23 (20.4) | 75 (15.0) | 14 (25.0) | 35 (16.9) | |||
Note: P values were obtained from the univariate association analyses between the pulmonary nodules and each clinical characteristic.