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Table 4 Multivariate analysis of overall and recurrence-free survival according to patient characteristics and treatment variables

From: Postoperative radiotherapy with or without concurrent chemotherapy for oral squamous cell carcinoma in patients with three or more minor risk factors: a propensity score matching analysis

Characteristic Overall survival p-value Overall survival HR (95% CI) Recurrence-free survival p-value Recurrence-free survival HR (95% CI)
Chemotherapy 0.017 0.426 (0.212–0.858) 0.002 0.248 (0.103–0.596)
Betel quid 0.004 3.951 (1.567–9.966) NS NS
Anemia 0.003 3.1 (1.488–6.461) NS NS
Pathological T4 NS NS 0.016 0.355 (0.153–0.826)
Invasion depth ≥ 11 mm 0.007 0.187 (0.055–0.632) < 0.001 0.077 (0.02–0.303)
Interval between surgery and PORT NS NS 0.003 3.872 (1.582–9.474)
  1. Abbreviation: HR hazard ratio, CI confidence interval, PORT postoperative radiotherapy, NS not significant