Table 2.

Moderators of prevalence and seroprevalence in school studies.

	PCR prevalence		Seroprevalence
Age	Odds ratios (95% CI)	p	Odds ratios (95% CI)	p
0–19 years (reference)	1	–	1	–
Early years ≤7 years	0.245 (0.030, 2.000)	0.189	–	–
Children 5–12 years	0.649 (0.207, 2.034)	0.458	1.567 (0.228, 10.773)	0.648
Adolescents 12–19 years	1.433 (0.429, 4.787)	0.559	1.185 (0.178, 7.877)	0.860
Community SARS-CoV-2 14 day incidence per 100,000 population (continuous)
Contemporary with study	1.003 (1.001, 1.004)	<0.001	1.001 (0.999, 1.003)	0.307
Month previous to study	1.003 (1.001, 1.006)	0.008	1.005 (1.000, 1.007)	0.038
Two months previous to study	1.001 (0.997, 1.005)	0.591	1.005 (1.002, 1.008)	0.003
School attendance (% in face-to-face learning)	1.001 (0.982, 1.021)	0.908	1.020 (0.977, 1.066)	0.375
PCR source
Swab (nasopharyngeal or oropharyngeal)	1		–
Saliva or gargle	1.54 (0.49, 4.84)	0.456	–