Table 2. Clinical characteristics of patients with RLNM and NRLNM in the training and validation cohorts.
| Variable | Training cohort (n=127) | Validation cohort (n=55) | |||
|---|---|---|---|---|---|
| NRLNM | RLNM | NRLNM | RLNM | ||
| Gender | |||||
| Male | 38 | 46 | 18 | 24 | |
| Female | 18 | 25 | 5 | 8 | |
| Age (years) | |||||
| Range | 42–74 | 48–82 | 47–78 | 50–80 | |
| Mean ± standard deviation | 64.88±5.78 | 67.52±4.43 | 65.72±3.58 | 66.79±7.28 | |
| Location of the tumor | |||||
| Upper thoracic esophagus | 6 | 9 | 3 | 4 | |
| Middle thoracic esophagus | 35 | 49 | 13 | 20 | |
| Lower thoracic esophagus | 15 | 13 | 7 | 8 | |
| Lymph node metastasis | 56 | 71 | 23 | 32 | |
RLNM, regional lymph node metastasis; NRLNM, non-regional lymph node metastasis.