Table 2. Baseline characteristics of all participants, including previous symptoms, PCR testing, and antibody detection

Participant characteristics	Total, n = 971	Previous symptoms suggestive of SARS-CoV-2,n = 339	Previous PCR nasopharyngeal swab for SARS-CoV-2,n = 139	Either antibody test positive,n = 118
Age, years	Mean	SD	Mean	SD	Mean	SD	Mean	SD
	53.0	17.2	49.8	15.4	51.7	13.6	50.3	15.8
	Median	Range	Median	Range	Median	Range	Median	Range
	55	18–97	51	18–88	53	20–84	54	18–80
Sex	Patients, n	Patients, %	Patients, n	Patients, %	Patients, n	Patients, %	Patients, n	Patients, %
Male	392	40	120	35	50	36	46	39
Female	579	60	219	65	89	64	72	61
Participant type
1. Patient	799	82	271	80	93	67	98	83
2. Healthcare staff	172	18	68	20	46	33	20	17
2.1 Administration	34	4	10	3	6	4	2	2
2.2 Nursing	51	5	24	7	16	12	8	7
2.3 Doctor	40	4	14	4	14	10	4	3
2.4 Other healthcare staff	47	5	20	6	10	7	6	5
History PCR and symptoms
Previous PCR test for SARS-CoV-2	139	14	108	32	139	100	43	36
Positive PCR test	33	24	28	26	33	24	27	63
Previous symptoms suggestive of SARS-CoV-2	339	35	—	—	108	78	83	70
Severity of symptoms
Mild	112	12	112	33	22	16	23	19
Moderate	193	20	193	57	70	50	52	44
Severe	34	4	34	10	16	12	8	7