How does the SARS-CoV-2 reinfection rate change over time? The global evidence from systematic review and meta-analysis

Table 1 Results of subgroup analysis

	Article number	Proportion	95% CI	τ²	P
Age					0.9317
>=18	4	0.0055	[0.0022; 0.0140]	0.8906
< 18	2	0.0062	[0.0007; 0.0554]	2.5809
Reinfected variants					0.0016
Wild	7	0.0026	[0.0010; 0.0066]	1.3937
Alpha	2	0.0059	[0.0043; 0.0082]	0.0247
Delta	3	0.0041	[0.0017; 0.0097]	0.5690
Omicron	7	0.0410	[0.0136; 0.1174]	2.3479
Country					< 0.0001
the United States	15	0.00106	[0.0051; 0.0222]	2.1674
the United Kingdom	6	0.0048	[0.0037; 0.0064]	0.0819
Türkiye	3	0.0064	[0.0015; 0.0266]	1.6089
Italy	4	0.0119	[0.0033; 0.0416]	1.6623
India	3	0.0297	[0.0031; 0.2332]	4.1048
Iran	2	0.0147	[0.0043; 0.0490]	0.7578
Israel	2	0.0147	[0.0121; 0.0179]	0.0196
Spain	3	0.0030	[0.0005; 0.0160]	2.1176
Canada	2	0.0136	[0.0134; 0.0139]	0
Brazil	2	0.0660	[0.0394; 0.1084]	0.1224
Denmark	2	0.0037	[0.0034; 0.0039]	0
Study population					0.1131
general population	46	0.0081	[0.0056; 0.0119]	1.2939
Healthcare workers	9	0.0192	[0.0071; 0.0508]	1.5238
Study type					0.0020
cohort study	46	0.0097	[0.0064; 0.0147]	2.0886
case-control study	6	0.0050	[0.0030; 0.0084]	0.3813
cross-sectional study	3	0.0213	[0.0114; 0.0394]	0.3128

ISSN: 1471-2334