Table 2.

Bivariate prevalence ratios for the associations between risk factors and positive SARS-CoV-2 antibody test and self-reported history of positive SARS-CoV-2 test

Predictor	Outcomes
	Positive SARS-CoV-2 antibody test (objective outcome)	Self-reported history of positive SARS-CoV-2 test (secondary outcome)
	PR (95% CI)	PR (95% CI)
Age	n = 1010	n = 1164
≥22 years	.92 (.34, 2.50)	.64 (.32, 1.27)
<22 years	Ref.	Ref.
Sex at birth	n = 1071	n = 1238
Female	1.35 (.73, 2.48)	.89 (.63, 1.24)
Male	Ref.	Ref.
Hispanic or Latinx ethnicity	n = 1076	n = 1239
Yes	1.79 (.78, 4.06)	1.04 (.57, 1.92)
No	Ref.	Ref.
Year in school	n = 1070	n = 1236
1st	.97 (.47, 1.99)	1.10 (.70, 1.72)
2nd	.85 (.41, 1.79)	1.15 (.74, 1.79)
3rd	.65 (.29, 1.43)	.85 (.53, 1.37)
4th or 5th	Ref.	Ref.
Residence	n = 1071	n = 1238
On -campus	1.07 (.60, 1.92)	1.29 (.92, 1.80)
Off-campus	Ref.	Ref.
Greek membership	n = 1070	n = 1236
Yes	3.28 (1.91, 5.64)	2.42 (1.75, 3.35)
No	Ref.	Ref.
Relationship status	n = 1072	n = 1238
Multiple partners	2.52 (1.19, 5.33)	2.18 (1.43, 3.33)
Single partner	1.04 (.56, 1.93)	.79 (.55, 1.15)
No partner	Ref.	Ref.
Self-reported history of positive SARS-CoV-2 test	n = 1059
Yes	16.73 (9.54, 29.33)	--
No	Ref.	--
Symptomatica	n = 96
Yes	1.51 (.65, 3.51)	--
No	Ref.	--
Know others who were infected	n = 1033	n = 1195
Yes	4.23 (2.07, 8.63)	3.03 (2.04, 4.49)
No	Ref.	Ref.
Number of days per week drinking alcohol	n = 1068	n = 1224
More than 1 day	1.79 (1.02, 3.16)	1.60 (1.14, 2.24)
1 day or less	Ref.	Ref.
Number of people hanging out with while drinkingb	n = 716	n = 827
More than 5 people	2.19 (1.20, 4.00)	1.98 (1.36, 2.90)
5 people or less	Ref.	Ref.

Boldface indicates p < .05.

CI = confidence interval; SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2.

^aAmong participants who self-reported positive SARS-CoV-2 test.

^bAmong participants who self-reported alcohol drinking.