Table 3.

COX multivariate analysis of invasion regions of NPC

Region	P	β	Exp(B)	95.0% CI for Exp(B)
Nasal cavity	0.030	0.579	1.785	1.057-3.012
Parapharyngeal space	0.045	0.589	1.802	1.014-3.203
Oropharynx	0.031	0.517	1.678	1.050-2.681
Skull base	0.025	0.685	1.984	1.088-3.617
Internal pterygoid muscle	0.014	0.767	2.153	1.170-3.960
External pterygoid muscle	0.024	1.230	3.422	1.175-9.962
Paranasal sinus	0.001	1.184	3.269	1.623-6.583
Infratemporal fossa	0.003	1.426	4.161	1.610-10.754
Orbit	0.003	1.577	4.843	1.716-13.665
Cranial nerves	0.001	1.634	5.126	2.933-8.960
Cavernous sinus	0.031	1.119	3.063	1.110-8.499
Intracalvarium	0.014	1.476	4.374	1.342-14.254