Table 4.

Gender and comorbidities between survival and nonsurvival patients.

Variable	Non-survival group (n = 16)	Survival group (n = 114)	Z value	p value
Female	3	34	−0.916	0.360
Male	16	80
Cerebrovascular disease	1	36	−2.095	0.086
Diabetes mellitus	5	23	−1.005	0.315
Coronary heart disease	9	41	−1.556	0.120
Chronic renal damage	3	13	−0.834	0.404
Treated nasopharyngeal carcinoma	0	2	−0.532	0.595