Table 3. Analysis of factors associated with SARS-CoV-2 IgG positivity.

	SARS-CoV-2 IgG		p-valuea	Univariate		Multivariate
Characteristics	negative	positive		OR (95% CI)	p-value	OR (95% CI)	p-valuec
Gender:			0.849		0.849
male	264 (14.2%)	2 (12.5%)		1
female	1599 (85.8%)	14 (87.5%)		1.16 (0.26‒5.11)
Age, median, IQR; yearsb	48 (38‒56)	50.5 (46‒57.5)	0.141	1.03 (0.99‒1.08)	0.131	1.04 (0.99‒1.09)	0.093
Professional category:			0.114
other without direct patient contact	639 (34%)	4 (25%)		1
nurse	635 (34%)	4 (25%)		1.01 (0.25‒4.04)	0.992
physician	364 (20%)	7 (44%)		3.07 (0.89‒10.56)	0.075
other with direct patient contact	225 (12%)	1 (6%)		0.71 (0.08‒6.39)	0.760
Healthcare department:			0.716		0.717
non-clinical	543 (29%)	4 (25%)		1
clinical	1320 (71%)	12 (75%)		1.23 (0.40‒3.84)
Previously tested for SARS-CoV-2 RNA			0.007		0.012		0.008
no	1454 (78.05%)	8 (50%)		1
yes	409 (21.95%)	8 (50%)		3.56 (1.33‒9.53)		3.82 (1.42‒10.29)

^aChi-squared test.

^bMann Whitney U test.

^cWald test.