. 2020 Jul 16;35(29):e269. doi: 10.3346/jkms.2020.35.e269

Table 2. Seroprevalence according to characteristics of study subjects.

Variables	Categories	No. of positive/No. of subjects	Seroprevalence, %	P value
All subjects		15/198	7.6
Reason for hospital visit	Patients	9/103	8.7	0.52
Reason for hospital visit	Guardians	6/95	6.3	0.52
Presence of confirmed COVID-19 cases among close contacts	Yes	1/7	14.3	0.43
Presence of confirmed COVID-19 cases among close contacts	No	14/191	7.3	0.43
History of COVID-19 PCR test	Yes	1/14	7.1	0.95
History of COVID-19 PCR test	No	14/184	7.6	0.95
History of COVID-19 related symptoms during the epidemic	Yes	2/16	11.1	0.55
History of COVID-19 related symptoms during the epidemic	No	13/180	7.2	0.55
Age, yr	< 40	2/43	4.7	0.48
	40–59	6/89	6.7
	≥ 60	7/66	10.6
Gender	Men	11/99	11.1	0.06
Gender	Women	4/99	4.0	0.06
Body mass index, kg/m²	< 25	12/140	8.6	0.41
Body mass index, kg/m²	≥ 25	3/58	5.2	0.41
Smoking	Current	7/46	15.2	0.01
	Ex	5/35	14.3
	Never	3/117	2.6
Diabetes	Yes	4/19	21.1	0.02
Diabetes	No	11/179	6.1	0.02
Hypertension	Yes	5/37	13.5	0.13
Hypertension	No	10/161	6.2	0.13

COVID-19 = coronavirus disease 2019, PCR = polymerase chain reaction.