Table 1.

Summary of baseline characteristics.

		Frequency Percent/Mean ± SD
Sex
	Male	164 (77.7%)
	Female	47 (22.3%)
Age
	Mean ± SD	62.19 ± 8.328
Tobacco
	Yes	167 (79.1%)
	No	44 (20.9%)
Alcohol
	Yes	141 (66.8%)
	No	70 (33.2%)
Type
	supra-glottic	106 (50.2%)
	glottis	92 (43.6%)
	sub-glottis	5 (2.4%)
	para-glottic	8 (3.8%)
Clinic stage
	I	55 (26.1%)
	II	48 (22.7%)
	III	34 (16.1%)
	IV	74 (35.1%)
T stage
	T1+ T2	150 (71.1%)
	T3+ T4	61 (28.9%)
N stage
	N0+ N1	151 (71.6%)
	N2+ N3	60 (28.4%)
pathological differentiation
	High	167 (79.1%)
	Low	44 (20.9%)
concurrent chemoradiotherapy
	Yes	72 (34.1%)
	No	139 (65.9%)