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Cox proportional hazard model in HNSCC patients based on the survival tree analysis
| Group | Observed | SPT/recurrence (%) | HR (95% CI)a | P |
| Low-risk (node 1) | 103 | 20 (19.42) | 1 | |
| Medium-risk (node 2) | 306 | 108 (35.29) | 2.16 (1.33–3.50) | 0.002 |
| High-risk (nodes 3–5) | 31 | 19 (61.29) | 5.24 (2.71–10.11) | <0.001 |
Adjusting for age, sex, smoking, ethnicity, tumor stage, tumor site and treatment. Bold numbers represent P values that are statistically significant at P < 0.05.
