Table 4.

Multivariate analysis

	Hazard ratio	95% confidence interval	P value
Mandible invasion	4.13	1.22–13.92	0.022
Facial nerve invasion	2.38	1.38–4.11	0.002
Skull base invasion	2.25	0.45–11.26	0.323
Skin invasion	2.04	1.04–4.00	0.037
Parapharyngeal space invasion	1.76	0.86–3.57	0.120
Masseter muscle invasion	1.52	0.80–2.89	0.202
External auditory canal invasion	1.06	0.40–2.79	0.909

Association of anatomical structures involved by the neoplasm with recovery