Table 3:

Factors associated with having detectable SARS-CoV-2 antibodies (univariable comparisons)

Variable	No. (%) of participants		p value
	SARS-CoV-2 serology positive n = 57*	SARS-CoV-2 serology negative n = 1005*
Symptomatic contacts in the household	7/53 (13.2)	25/971 (2.6)	< 0.001
Provided direct care to patients with COVID-19	27 (47.4)	412/995 (41.4)	0.5
Unprotected occupational exposure to a patient with COVID-19†	8/27 (29.6)	33/411 (8.0)	< 0.001
Worked on a unit with a COVID-19 outbreak	5 (8.8)	115/996 (11.5)	0.7
Contacted by public health to indicate exposure	9 (15.8)	54/985 (5.5)	0.003
Known positive PCR test at baseline	31 (54.4)	9 (0.9)	< 0.001

Note: PCR = polymerase chain reaction.

^*The denominator of each outcome variable is the total in the column heading unless stated otherwise.

^†Only those health care workers who indicated they had direct patient contact were asked this question.