Table 4.

Multifactor influence after operation.

Influencing factors	β	S.E.	Wald	OR	95%CI	P
Age	1.56	0.45	19.54	8.61	3.41–11.69	0.00
Type of ligature	1.69	0.58	11.35	5.91	1.98–13.91	0.01
Inner ring mouth diameter	2.01	0.69	8.61	9.54	1.68–36.51	0.00