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. 2024 Aug 28;12(10):e00691-24. doi: 10.1128/spectrum.00691-24

TABLE 1.

SARS-CoV-2 infection-induced seroprevalence by school mask group, age group, and time period

	September 1–30, 2021				December 15 to January 14, 2022				Combined dates
	Total	Seropositive		P value^a	Total	Seropositive		P value^a	Total	Seropositive		P value^a
	n = 2,694^b	n = 1,010	%^c		n = 2,520^b	n = 1,287	%		n = 5,214	n = 2,297	%
School Mask Policy (5–17)
Full	1,989	677	34.6	<0.0001	1,860	874	47.1	<0.0001	3,849	1551	41.0	<0.0001
None	705	333	47.3		660	413	62.1		1,365	746	54.3
School Mask Policy (5–11)
Full	714	225	33.3	0.0007	608	289	46.7	0.0054	1,322	514	39.9	<0.0001
None	210	100	47.5		207	125	59.4		417	225	53.0
School Mask Policy (12–17)
Full	1,275	452	36.1	0.0003	1,252	585	47.5	<0.0001	2,527	1,037	42.2	<0.0001
None	495	233	47.2		453	288	64.3		948	521	55.3

^{^a}

Pearson’s χ² test was used to examine differences in proportions between groups.

^{^b}

1285 ZCTAs for September 1–30, 2021 and 1,323 ZCTAs for December 15, 2021 to January 14, 2022 were represented in the analysis.

^{^c}

The seroprevalence is estimated with survey weights adjusting for age, sex, and metro status.