Table 2.

Analysis on the durability of protection against Omicron reinfection with hybrid immunity (incomplete vaccination) (days).^a

Time from incomplete vaccination to reinfection	Number of articles	Number of studies	Pooled PE estimate and 95% CI	p	I2 (%)	p	Effect model	p for Egger’s test
<60	4	9	66.76% (58.20–75.32%)	<0.001	76.3	<0.001	Random
60 ~ 89	2	3	64.25% (53.72–74.77%)	<0.001	78.1	0.010	Random
90 ~ 179	11	35	59.50% (55.56–63.44%)	<0.001	97.8	<0.001	Random	0.159
180 ~ 209	2	7	50.72% (34.12–67.32%)	<0.001	95.1	<0.001	Random
210 ~ 269	7	13	42.15% (32.88–51.41%)	<0.001	98.8	<0.001	Random	0.656
270 ~ 364	8	12	37.88% (28.88–46.89%)	<0.001	98.1	<0.001	Random	0.022
365 ~ 639	8	15	33.23% (23.80–42.66%)	<0.001	97.8	<0.001	Random	0.839

^aThe exposed group was hybrid immunity (incomplete vaccination); the control group was never infected and unvaccinated.