Table 1.
Patient background information
| Training | Validation | Test (esophageal cancer positive) | Test (esophageal cancer negative) | Comparison | |
|---|---|---|---|---|---|
| Age (years) | 67.4 ± 9.9 | 68.4 ± 11.8 | 71.3 ± 9.8 | 67.2 ± 11.9 | p = 0.193 |
| Male/Female | 169/31 | 23/2 | 20/5 | 21/4 | p = 1.000 |
| Biopsy/Surgery | 75/125 | 11/14 | 9/16 | N/A | N/A |
| Main location | N/A | ||||
| Cervical | 15 | 3 | 0 | N/A | |
| Upper thoracic | 36 | 6 | 7 | N/A | |
| Middle thoracic | 88 | 11 | 12 | N/A | |
| Lower thoracic | 61 | 5 | 6 | N/A | |
| Length of esophageal cancer (mm) | 54.6 ± 28.2 | 46.6 ± 22.8 | 41.2 ± 23.9 | N/A | N/A |
| T stage | p = 0.652 | ||||
| T1 | 27 | 4 | 3 | N/A | |
| T2 | 72 | 8 | 14 | N/A | |
| T3 | 81 | 11 | 7 | N/A | |
| T4 | 20 | 2 | 1 | N/A | |
| Pathology | N/A | ||||
| SCC | 178 | 24 | 24 | N/A | |
| adenocarcinoma | 13 | 0 | 0 | N/A | |
| Other | 9 | 1 | 1 | N/A |
N/A, not applicable; SCC, squamous cell carcinoma.
For continuous parameters, comparisons between esophageal cancer positive and negative tests were performed by using the Student’s t-test, whereas the chi-square test was used for categorical parameters.