Table 1.
Baseline characteristics of the dataset
| Characteristics n (%) | Patient count or mean | % or SD |
|---|---|---|
| (n = 3352) | ||
| Gender, n (%) | ||
| Female | 708 | 21.1% |
| Male | 2644 | 78.9% |
| Age (mean, years) | 61.24 | 7.77 |
| BMI (mean, kg/m2) | 22.86 | 2.71 |
| Smokers, n (%) | 2156 | 64.3% |
| Alcohol, n (%) | 2057 | 61.4% |
| Family history of cancer, n (%) | 816 | 24.3% |
| Family history of ESCC, n (%) | 531 | 15.8% |
| Tumor location, n (%) | ||
| upper | 319 | 9.5% |
| middle | 2176 | 64.9% |
| lower | 857 | 25.6% |
| Pathologic T stage, n (%) | ||
| Tis | 44 | 1.3% |
| T1a | 201 | 6.0% |
| T1b | 801 | 23.9% |
| T2 | 1192 | 35.6% |
| T3 | 1103 | 32.9% |
| T4a | 11 | 0.3% |
| Tumor grade, n (%) | ||
| Gx | 51 | 1.5% |
| G1 | 292 | 8.7% |
| G2 | 2062 | 61.5% |
| G3 | 947 | 28.3% |
| Tumor size (mean ± SD, cm) | 3 | 1.5 |
| Pathologic N stage, n (%) | ||
| N0 | 1833 | 54.7% |
| N1 | 906 | 27.0% |
| N2 | 441 | 13.2% |
| N3 | 172 | 5.1% |
| Thoracic LN, n (%) | ||
| Positive | 748 | 22.3% |
| Negative | 2604 | 77.7% |
| Abdomen LN, n (%) | ||
| Positive | 755 | 22.5% |
| Negative | 2597 | 77.5% |
| Pathology-confirmed RLN LN, n (%) | ||
| Left | 3249 | |
| Positive | 351 | 10.8% |
| Negative | 2898 | 89.2% |
| Right | 3344 | |
| Positive | 569 | 17.0% |
| Negative | 2775 | 83.0% |
SD standard deviation, BMI body mass index, ESCC esophageal squamous cell carcinoma, LN lymph node, RLN recurrent laryngeal nerve