Table 2.

Univariate and multivariate analysis of risk factors for seroconversion of SARS-CoV-2 among HCWs.

Variables	Univariate		Multivariate
	OR (95% CI)	P-value	OR (95% CI)	p value
Age	0.947 (0.888, 1.010)	0.1
Gender
Female	Reference
Male	0.419 (0.089, 1.978)	0.272
≥30 min at a distance of <1 m
No	Reference
Yes	3.478 (1.224, 9.887)	0.019	2.231 (0.556, 8.951)	0.258
Close contacts of Patient No.
Patient 1	Reference
Patient 2	7.125 (1.627, 31.210)	0.009	6.605 (1.123, 38.830)	0.037
Patient 3	1.847 (0.498, 6.858)	0.359	0.083 (0.004, 1.609)	0.100
Patient 4	1.900 (0.176, 20.559)	0.597	0.722 (0.022, 24.013)	0.856
Disposable non-surgical face mask wearing
No	Reference
Yes	0.349 (0.121, 1.008)	0.052	0.127 (0.017, 0.968)	0.046
Exposure times
<5	Reference
5-9	0.911 (0.225, 3.680)	0.896
≥10	0.580 (0.149, 2.259)	0.432
Relationship with the COVID-19 patient
Colleague	Reference
Doctor	3.850 (1.131, 13.105)	0.031	346.837 (8.924, 13479.434)	0.002
Nurse	0.478 (0.094, 2.440)	0.375	19.523 (0.667, 571.463)	0.085
General service assistant	0.550 (0.062, 4.911)	0.593	13.294 (0.265, 666.605)	0.195