Table 3.

Multivariable logistic regression model of factors associated with the prevalence of SARS-CoV-2 serum antibodies at follow-up.

	Model 1a		Model 2b
	Adjusted OR (95% CI)	P-value	Adjusted OR (95% CI)	P-value
Sex
Males	2.52 (1.05–6.06)	0.039	4.77 (1.26–18.05)	0.021
Females	Reference
Profession		0.164		0.087
Physician	Reference		Reference
Nurse	2.38 (0.92–6.17)	0.076	4.26 (1.08–16.77)	0.038
Other	1.24 (0.37–4.16)	0.730	1.34 (0.22–7.99)	0.751
Requested to be quarantined due to exposure to a confirmed COVID-19 patient
Yes	3.54 (1.58–7.89)	0.002	1.97 (0.59–6.59)	0.259
No	Reference		Reference
A quarantined family member due to exposure to a COVID-19 patient
Yes	2.09 (0.94–4.65)	0.069	2.17 (0.67–6.99)	0.196
No	Reference
Result of SARS-CoV-2 PCR test				<0.001
Positive	Not included		109.5 (23.88–502.12)
Negative			Reference

^aP value = 0.672 by the Hosmer & Lemeshow test. Model summary Nagelkerke R square = 0.147.

^bP value = 0.553 by the Hosmer & Lemeshow test. Model summary Nagelkerke R square = 0.555. OR, odds ratio; CI, confidence intervals.