Table 2. Univariate analysis of risk factors impacting postoperative major wound infection of all patients.

Variable		Number	Major wound infection	p
Stage	III	45	9	0.326
	IV	188	51
Salvage surgery	No	174	42	0.334
	Yes	59	18
Primary cancer site	Not hypopharynx	207	48	0.018
	Hypopharynx	26	12
Preoperative serum albumin level (g/dL)	<3.5	16	6	0.253
	≧3.5	217	54
Postoperative serum albumin level (g/dL)	<3.5	187	58	<0.001
	≧3.5	46	2
Age	<60	160	39	0.477
	≧60	73	21
BMI (Kg/m2)	<22	96	24	0.826
	≧22	137	36
Diabetes mellitus	No	180	47	0.817
	Yes	53	13