TABLE 1.

General information about cases enrolled in the neutralizing antibody test.

Characteristic	Total (N = 170)	COVID-19 patients			Healthy persons (N = 20)
		1–2.5 months (N = 43)	10–11 months (N = 62)	17–18 moths (N = 45)
Admission/discharge		Inpatients	Convalescents	Convalescents	NA
Sex, n (%)
Male	75 (44.1)	22 (51.2)	21 (29.4)	25 (55.6)	7 (35.0)
Female	95 (55.9)	21 (48.8)	41 (70.6)	20 (44.5)	13 (65.0)
Age, years, median (IQR)	53 (42.5, 63)	59.5 (36.5, 70)	55.0 (30, 86)	55.4 (33, 85)	38 (27, 42)
Age (year)
<60, n (%)	110 (64.7)	22 (51.2)	42 (67.7)	28 (62.2)	18 (90.0)
≥60, n (%)	60 (35.3)	21 (48.8)	20 (32.3)	17 (37.8)	2 (10.0)
Severity of COVID-19, n (%)
Mild	85 (56.7)	15 (34.9)	34 (54.8)	36 (80.0)	NA
Severe	65 (43.3)	28 (65.1)	28 (45.2)	9 (20.0)
The median time between symptom onset to blood sampling (min, max)		50 (21,76) days	10–11 months	17–18 months	NA

IQR, interquartile range; NA, not available.