Table 7. Logistic regression model for the outcome ‘dead or alive at 60 months’.

Logistic regression
Variable	Value	B	SE	P-value	OR	95% CI
Tumor location	Glottic larynx (ref)	0.00	−	−	1.00	−
	Lip	0.04	0.31	0.89	1.05	[0.57−1.91]
	Oral cavity	1.00	0.21	0.00	2.73	[1.83−4.07]
	Oropharynx	0.76	0.25	0.00	2.15	[1.32−3.50]
	Nasopharynx	−0.09	0.41	0.82	0.91	[0.41−2.03]
	Hypopharynx	0.80	0.26	0.00	2.21	[1.33−3.68]
	Supraglottic larynx	0.39	0.22	0.07	1.48	[0.97−2.26]
ACE27	Grade 0 (ref)	0.00	−	−	1.00	−
	Grade 1	0.04	0.18	0.82	1.04	[0.74−1.47]
	Grade 2	0.36	0.19	0.06	1.43	[0.99−2.08]
	Grade 3	1.09	0.31	0.00	2.97	[1.62−5.45]
T-class	T1 (ref)	0.00	−	−	1.00	−
	T2	0.67	0.17	0.00	1.95	[1.38−2.74]
	T3	0.90	0.21	0.00	2.47	[1.62−3.76]
	T4	1.30	0.21	0.00	3.68	[2.44−5.55]
N-class	N0 (ref)	0.00	−	−	1.00	−
	N1	0.73	0.22	0.00	2.08	[1.34−3.22]
	N2	1.02	0.22	0.00	2.76	[1.81−4.22]
	N3	2.13	0.38	0.00	8.40	[3.98−17.72]
M-class	M0 (ref)	0.00	−	−	1.00	−
	M1	1.65	0.85	0.05	5.23	[0.99−27.63]
Prior malignancies	No (ref)	0.00	−	−	1.00	−
	Yes	1.04	0.24	0.00	2.83	[1.78−4.50]
Gender	Male (ref)	0.00	−	−	1.00	−
	Female	−0.05	0.17	0.77	0.95	[0.68−1.33]
Age at diagnosis per decade		0.49	0.06	0.00	1.63	[1.44−1.84]
Constant		−4.79	0.44	0.00	0.01	−

B: Regression coefficient.

SE: Standard error regression coefficient.

OR: Odds ratio.

CI: Confidence interval.