| Patients clinical characteristics | n (%) |
| Age (median, range) | 67 years (37 - 89) |
| Sex | 2.3 |
| - Male | 193 (69.4) |
| - Female | 85 (30.6) |
| Primary site in esophagus |
|
| - Cervical | 16 (5.8) |
| - Upper thoracic | 81 (29.1) |
| - Middle thoracic | 126 (45.3) |
| - Lower thoracic | 55 (19.8) |
| Dysphagia |
|
| - Grade 1 | 103 (37.1) |
| - Grade 2 | 175 (62.9) |
| Tumor stage |
|
| - Stage I | 26 (9.4) |
| - Stage II | 201 (72.3) |
| - Stage III | 51 (18.3) |
| Radiotherapy |
|
| - IFRT | 205 (73.7) |
| - ENI | 73 (26.3) |
| Chemotherapy |
|
| - cCRT | 44 (15.8) |
| - sCRT | 28 (10.1) |
| - No | 206 (74.1) |