Table 1.
Demographic And Clinicopathological Characteristics Of The Patients In The Training Cohort And Validation Cohort
| Characteristic | Training Cohort (n=1778) | Validation Cohort (n=146) | P value |
|---|---|---|---|
| Age, year (mean±SD) | 66.41±9.51 | 60.03±9.02 | <0.0001 |
| ≤60 | 483 | 81 | <0.001 |
| 60~70 | 646 | 49 | |
| >70 | 649 | 16 | |
| Gender | |||
| Male | 1177 | 135 | <0.001 |
| Female | 601 | 11 | |
| Laterality | 0.052 | ||
| Left | 830 | 56 | |
| Right | 948 | 90 | |
| Type of surgery | 0.013 | ||
| Lobectomy | 1406 | 128 | |
| Pneumonectomy | 372 | 18 | |
| Chemotherapy | <0.001 | ||
| No | 591 | 92 | |
| Yes | 1187 | 54 | |
| Postoperative Radiotherapy | <0.001 | ||
| No | 1211 | 567 | |
| Yes | 112 | 18 | |
| T category | <0.001 | ||
| T1 | 329 | 8 | |
| T2 | 651 | 67 | |
| T3 | 448 | 48 | |
| T4 | 350 | 23 | |
| Grade | 0.306 | ||
| Well differentiated | 22 | 2 | |
| Medium/poorly differentiated | 1637 | 140 | |
| Undifferentiated | 20 | 1 | |
| Unknow | 99 | 3 | |
| LNs resected | <0.001 | ||
| <12 | 867 | 29 | |
| ≥12 | 911 | 117 |
Abbreviations: SD, standard deviation; LNs, lymph nodes.