Table 1. Patient and disease characteristics and number of recurrences during 10 years' follow-up of 1615 patients with laryngeal squamous cell carcinoma treated during 1983–2010.

	Recurrence n = 368		Non-recurrence n = 1247
	n	%	n	%
Sex
Male	322	88	1081	87
Female	46	12	166	13
Smoking
Ever	326	89	1108	89
Never	30	8	67	5
Unknown	12	3	72	6
Alcohol
Ever	61	17	162	10
Never	213	58	715	60
Unknown	94	25	370	30
Age (years)
0–59	130	35	328	26
60–69	131	36	411	33
≥70	107	29	508	41
Subsite
Glottic	243	66	884	71
Supraglottic	113	31	324	26
Subglottic	12	3	39	3
T-status
T1	90	24	577	46
T2	120	33	267	21
T3	85	23	146	12
T4	73	20	257	21
N-status
N0	300	82	1043	84
N1	23	6	76	6
N2+	45	12	128	10
M-status
M0	368	100	1233	99
M1	0	0	14	1
Stage
Early stage	194	53	789	63
Advanced stage	174	47	458	37
Stage I-IV
I	87	24	563	45
II	107	29	223	18
III	76	21	146	12
IV	98	26	315	25
Treatment modality
Radiotherapy	271	74	737	59
Transoral lasermicrosurgery	38	10	294	24
Total laryngectomy	41	11	138	11
Chemo-radiotherapy	18	5	37	3
Palliative/ no treatment	0	0	41	3
Period of treatment
1983–1989	113	31	289	23
1990–1996	89	24	288	23
1997–2003	93	25	309	25
2004–2010	73	20	361	29
Length of follow-up
<1 year	183	50	222	18
1–2 years	143	39	239	19
3–5 years	34	9	237	19
6–10 years	8	2	549	44