Table I.

Clinical characteristics.

		N	%
Sex	Male	318	69.9
	Female	137	30.1
Site of T	Oral cavity	232	51.0
	Oropharynx	62	13.6
	Supraglottic larynx	40	8.8
	Glottic larynx	92	20.2
	Hypopharynx	29	6.4
cT (clinical class of T)	1	134	29.5
	2	144	31.6
	3	88	19.3
	4	89	19.6
cN (clinical class of N)	0	340	74.7
	1	34	7.5
	2	1	0.2
	2a	20	4.4
	2b	46	10.1
	2c	14	3.1
TNM stage	I	125	27.5
	II	116	25.5
	III	84	18.4
	IV	130	28.6
Previous treatment	No	354	77.8
	Yes	101	22.2
Surgery of glottic larynx	Transoral	33	35.9
	Partial laryngectomy	16	17.4
	Total laryngectomy	43	46.7
Main instrument (for all T sites)	Cold	114	25.1
	Electrosurgical blade	159	34.9
	Laser	112	24.6
	Radiofrequencies	10	2.2
	Energy-based technology*	49	10.8
	Other	2	0.4
	Missing	9	2.0
Surgery of N	No	126	27.7
	Yes selective	253	55.6
	Yes all levels	76	16.7
Type of N surgery	En bloc with T	117	25.71
	Discontinuous	205	45.05
	Deferred	5	1.10
	Missing	128	28.13

^* Harmonic, Ligasure, EnSeal, Gyrus PK et al.