Table 4. Univariate analysis of risk factors impacting survival of all patients.

Variable		Number	Event	OS (%)	p	Event	DSS (%)	p	Event	DFS (%)	p
Cancer stage	III	45	11	75.8	0.053	6	85.7	0.064	10	76.7	0.056
	IV	188	69	61.6		45	71.6		65	62.7
Salvage surgery	No	174	49	71.3	<0.001	29	81	<0.001	48	70.7	0.004
	Yes	59	31	44.8		22	55.6		27	50.2
Primary cancer site	Not Hypopharynx	206	70	65.3	0.881	43	75.8	0.648	65	66.1	0.908
	Hypopharynx	27	10	56.6		8	66.2		10	61.8
Preoperative albumin level (g/dL)	<3.5	16	10	34.4	0.011	7	49.2	0.02	9	39.7	0.036
	≧3.5	217	70	66.9		44	76.4		66	67.4
Postoperative albumin level (g/dL)	<3.5	187	65	64.8	0.807	41	74.8	0.987	56	66.7	0.781
	≧3.5	46	15	62.6		10	73.3		16	61.8
BMI (Kg/m2)	<22	96	35	61.8	0.532	24	70.8	0.353	32	64	0.824
	≧22	137	45	66.3		27	77.2		43	66
Diabetes mellitus	No	180	59	66.8	0.451	39	74.9	0.897	60	64.6	0.523
	Yes	53	21	56.7		12	73.5		15	68

Notes.

OS

overall survival

DSS

disease specific survival

DFS

disease free survival