Table 2.

Characteristics of COVID-19 patients with or without SARS-CoV-2 nucleocapsid antigenemia.

Variable	With antigenemia (n = 92)	Without antigenemia (n = 61)	P
Age [years, M (IQR)]	49 (16)	31 (21)	<0.001
Females [n (%)]	40 (43.48)	29 (47.54)	0.740
IgM positive [n (%)]	25 (27.17)	36 (59.02)	0.001
IgG positive [n (%)]	20 (21.74)	36 (59.02)	<0.001
Clinical typing [n (%)]
Asymptomatic	2 (15.38)	11 (84.62)	<0.001
Mild	5 (45.45)	6 (54.54)	0.002
Moderate	69 (61.06)	44 (38.94)	0.001
Severe & critical	16 (100.00)	0 (0)	Reference
Days after illness onset [n (%)]∗
0–2	17 (62.96)	10 (37.04)	0.040
3–5	24 (75.00)	8 (25.00)	0.002
6–8	28 (84.85)	5 (15.15)	0.001
9–11	12 (70.59)	5 (29.41)	0.030
12–14	6 (33.33)	12 (66.66)	0.700
15–17	3 (23.08)	10 (76.92)	Reference
Days from illness onset to recovery [M (IQR)]∗	24 (10)†	21 (13)	0.020
Mild	34 (10)	30 (9)	0.360
Moderate	24 (10)	21 (12)	0.030
Severe & critical	23 (8)†	0 (0)	Reference

M (IQR): median (interquartile rang); –: Not applicable.

^∗Asymptomatic patients were not involved because of no illness onset.

^†Excluded one patient who died on day 8 after illness onset.