Table 5.

Spatial regression of sociodemographic predictors of SARS-CoV-2 attack rates in schools, South Korea, January 2020 – October 2021

		Student populations
Model	Variable	Coeff.	SE	P	Akiake information criterion	R2
Schools	Constant	12.5544	6.5620	0.0569	817.7580	0.4754
	Population density	0.0000	0.0000	0.0130
	Attack rate of age 30–59	0.2493	0.0243	0.0000
	Class size (early childhood)	−0.0926	0.0444	0.0380
	Class size (primary school)	−0.0450	0.0521	0.3884
	Class size (middle school)	0.1057	0.0431	0.0150
	Class size (high school)	0.0003	0.0337	0.9933
	No. of private institute per 1000 persons	−0.3175	0.1841	0.0859
	Percentage of foreign citizens	−0.0859	0.0348	0.0143
	1-dose vaccine coverage	−0.2444	0.4682	0.6021
	2-dose vaccine coverage	0.1056	0.4344	0.8081
	3-dose vaccine coverage	3.0962	1.2728	0.0157
Community	Constant	−15.6523	14.1728	0.2705	1224.0200	0.5583
	Population density	0.0002	0.0000	0.0007
	Percentage of age 3–18 in population	−57.8203	11.2856	0.0000
	Percentage of age 30–59 in population	55.0022	7.3242	0.0000
	Percentage of foreign citizens	0.3733	0.0732	0.0000
	1-dose vaccine coverage	−0.2772	1.0552	0.7930
	2-dose vaccine coverage	0.3334	0.9875	0.7359
	3-dose vaccine coverage	−0.1973	2.7923	0.9437