| OM grading | Description |
|---|---|
| 0 | None |
| I | Oral soreness, erythema |
| II | Erythema, ulcers, solid diet tolerated |
| III | Ulcers, liquid diet only * |
| IV | Oral alimentation impossible |
↵*For this study, OM grade II–III included those patients who had ulcers but could tolerate some solid food as well as liquid.