Table 2.

Univariate and multivariate logistic regression analysis to predict the presence of anti-SARS-CoV-2.

	Univariated regression		Multivariated regression
	Odds Ratio (95% CI)	p	Odds Ratio (95% CI)	p
Period
June 2020	Reference	‒
October 2020	2.185 (1.694‒2.817)	<0.001	2.151 (1.631‒2.838)	<0.001
February 2021	3.451 (2.701‒4.410)	<0001	3.440 (2.633‒4.496)	<0.001
Age groups
16‒29	Reference	‒
30‒39	1.053(0.836‒1.327)	0.662	1.093 (0.852‒1.402)	0.485
40‒49	0.906 (0.71‒1.157)	0.431	0.849 (0.652‒1.105)	0.223
>50	0.629 (0.473‒0.838)	0.002	0.543 (0.395‒0.745)	<0.001
Ethnic
Caucasian/Asian	Reference	‒
Afro-descendants	1.770 (1.340‒2.338)	<0.001	1.594 (1.174‒2.165)	0.003
School grade
Elementary school	Reference	‒
High school	1.002 (0.724‒1.386)	0.992	0.865 (0.6000‒1.247)	0.437
University education	0.510 (0.358‒0.727)	<0.001	0.472 (0.315‒0.706)	<0.001
Transportation
Individual	Reference	‒
Public	1.767 (1.454‒2.148)	<0.001	1.558 (1.267‒1.917)	<0.001