Table 5.

Risk factors of laboratory-confirmed SARS-CoV-2 infection at month 3 in high-risk healthcare workers, accounting for adherence to personal protective equipment recommendations (after imputation of missing data; N = 916)).

	Bivariate analysis			Multivariable analysis
	OR	[95% CI]	p value	OR	[95% CI]	p value
Age	0.99	[0.97; 1.01]	0.24	0.99	[0.97; 1.016]	0.51
Women	1.07	[0.70; 1.62]	0.74	0.99	[0.60; 1.65]	0.89
Working in a referent hospital for emerging biological risk	0.97	[0.67; 1.42]	0.80	1.20	[0.77; 1.86]	0.43
Working department			0.0001			0.01
Intensive care unit	1			1
Emergency department	1.93	[1.17; 3.18]		1.86	[1.05; 3.31]
Infectious diseases department	3.10	[1.85; 5.22]		2.38	[1.30; 4.35]
Professional category			0.17			0.25
Physicians	1			1
Medical students	1.80	[0.93; 3.49]		1.76	[0.69; 4.51]
Care assistants	0.82	[0.45; 1.47]		1.21	[0.58; 2.50]
Nurses	1.19	[0.74; 1.92]		1.75	[0.96; 3.18]
Experience in the department ≥ 12 months	0.77	[0.51; 1.16]	0.22	1.26	[0.63; 2.52]	0.55
Experience in the job ≥ 12 months	0.87	[0.48; 1.56]	0.65	0.92	[0.39; 2.18]	0.77
Night shift	0.93	[0.54; 1.61]	0.80	0.93	[0.47; 1.83]	0.83
Public transportation use	1.34	[0.91; 1.99]	0.14	1.28	[0.83; 1.95]	0.27
Active smoker	0.37	[0.21; 0.66]	0.0006	0.36	[0.20; 0.64]	0.0006
Adherence to PPE recommendations over the study perioda
Wear a surgical mask < 4	0.70	[0.29; 1.67]	0.44	0.57	[0.21; 1.57]	0.28
Wear an N95 mask to take nasopharyngeal swabs < 4	1.02	[0.61; 1.71]	0.71	1.02	[0.56; 1.87]	0.71
Wearing an N95 mask to handle a confirmed COVID-19 case < 4	1.58	[0.99; 2.51]	0.06	1.36	[0.78; 2.35]	0.29
If wearing a mask (surgical or FFP2), change every 4 h < 4	1.35	[0.90; 2.04]	0.16	1.32	[0.82; 2.13]	0.26

Data are n (%) for qualitative variables; median [interquartile range] for quantitative variables; OR: odds ratio; CI: confidence interval.

^aCollected at the end of the study on a 5-point Likert scale (0 = never to 5 = systematically), reported as the proportion of HCW rating 4 or 5; PPE: personal protective equipment.