| Age | Scalar | 1 | N/A (continuous value) |
| Sex | One-hot | 2 | [‘Male’, ‘Female’] |
| ECOG PS | Scalar | 1 | N/A (ordinal scale 0–4) |
| Smoking pack-years | Scalar | 1 | N/A (continuous value) |
| Smoking status | One-hot | 3 | [‘Current’, ‘Former’, ‘Never’] |
| Disease site | One-hot | 19 | [‘Oropharynx’, ‘Larynx’, ‘Hypopharynx’,…] |
| Tumor subsite | One-hot | 63 | [‘Tonsil’, ‘Base of tongue’, ‘Glottis’,…] |
| Tumor size category (T) | One-hot | 17 | [‘T1’, ‘T2’, ‘T3’, ‘T4a’, ‘T4b’,…] |
| Nodal involvement (N) | One-hot | 10 | [‘N0’, ‘N1’, ‘N2a’, ‘N2b’, ‘N2c’,…] |
| Metastasis status (M) | One-hot | 2 | [‘M0’, ‘M1’] |
| Clinical stage | One-hot | 14 | [‘I’, ‘II’, ‘III’, ‘IVA’, ‘IVB’, ‘IVC’] |
| Pathological type | One-hot | 41 | [‘SCC’, ‘Adenocarcinoma’,…] |
| HPV status | One-hot | 2 | [‘Positive’, ‘Negative’] |