Table 5. Results of logistic regression analysis.

Variable	Groups	B	Exp (B)	95% CI	P value
Age	<75 versus ≥75	0.871	0.419	0,210–0.833	0.013
Histologic structure	others versus squamous cell carcinoma	1.113	0.329	0.165–0.653	0.002
Cerebrovascular disease	− versus +	1.600	0.262	0.079–0.513	0.001

B, regression coefficient; CI, confidence interval