Table 5.

Regression analysis of immune status after hospital booster vaccine policy

Exposure variable	Odds ratio	P-value	95% CI
			Lower	Upper
Year
2003–2012 (before hospital policy)	1.000	–	–	–
2013	1.129	0.779	0.484	2.632
2014	1.013	0.715	0.423	2.486
2015	2.036	0.046	1.283	4.216
2016	1.098	0.815	0.502	2.401
2017	1.680	0.046	1.001	2.667
2018	2.088	0.049	1.100	4.360