Introduction of Two-Dose Mumps-Containing Vaccine into Routine Immunization Schedule in Quzhou, China, Using Cox-Proportional Hazard Model

Table 1

Basic characteristics of mumps among children born from 2006 to 2010 in Quzhou.

Characteristics	Before SIA		After SIA			value
	No.	%	No.	%
All cases	163	17.93	746	82.07	15.21	<0.001
Person-year	299698	23.41	980674.5	76.59
Gender					0.904	0.342
Male	100	61.35	487	65.28
Female	63	38.65	259	34.72
Dose of MuCV					262.52	<0.001
Without MuCV	47	28.83	27	3.62
One-dose MuCV	116	71.17	238	31.90
Two-dose MuCV	—	—	481	64.48
Group classification					144.81	﹤0.001
Scattered children	85	52.15	115	15.42
Kindergarten children	3	1.84	315	42.22
Student	75	46.01	316	42.36
Year of birth^a					33.467	<.001
2006	82	50.31	143	19.17
2007	59	36.20	170	22.79
2008	17	10.43	163	21.85
2009	4	2.45	146	19.57
2010	1	0.61	124	16.62

^aCochran’s and Mantel-Haenszel (CMH) test was used to analyze the influence of birth cohort to mumps incidence before and after SIA. , 95% CI (0.539-0.766).