Long-term outcomes of a phase II randomized controlled trial comparing intensity-modulated radiotherapy with or without weekly cisplatin for the treatment of locally recurrent nasopharyngeal carcinoma

Table 3 Multivariate Cox regression model of overall survival of patients with non-metastatic locally recurrent NPC

Variable	β	Relative risk	P value^a	Hazard ratio	95% confidence interval
rT1–2 category vs. rT3–4 category^b	4.592	1.219	0.000	98.668	9.053–1075.343
Stages I–II versus Stages III–IV^b	–2.802	1.098	0.011	0.061	0.007–0.522
CCRT versus RT	0.942	0.313	0.003	2.566	1.389–4.740
≤46 years versus >46 years	0.990	0.309	0.001	2.692	1.470–4.931

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