Table 2.

Influenza vaccination rate of HCWs in different groups.

Groups	Reference(n)	Test of heterogeneity result			Meta-analysis results
		P	I2(%)	Effect model	Rate (%)	95% CI
Economic development levels
Developing country	67	<0.001	99.9	Random	46.9	(38.0, 55.9%)
Developed country	58	<0.001	99.8	Random	35.6	(30.1, 41.1%)
Geographic region
Asia	45	<0.001	99.8	Random	28.5	(23.2, 33.8%)
Europe	45	<0.001	99.9	Random	42.5	(31.2, 53.8%)
America	17	<0.001	99.9	Random	67.1	(48.9, 85.4%)
Africa	1	–	–	Random	6.5	(4.7, 8.3%)
Oceania	1	–	–	Random	48.7	(42.7, 54.7%)
Middle East	16	<0.001	99.6	Random	51.3	(38.1, 64.5%)
Vaccination time
~2008	13	<0.001	99.8	Random	39.4	(21.9, 56.8%)
2009–2012	28	<0.001	99.8	Random	46.7	(37.9, 55.6%)
2013–2016	33	<0.001	99.8	Random	46.5	(35.8, 57.2%)
2017–2019	39	<0.001	100.0	Random	31.4	(18.5, 44.3%)
2020~	12	<0.001	99.7	Random	52.8	(41.9, 63.8%)
Total	125	<0.001	99.9	Random	41.7	(35.7, 47.7%)