Table 4. MIS-C characteristics of published studies and this study

Variables	Feldstein et al. [25],USA (n = 186)	You et al. [26],Korea (n = 22)	This study,Korea (n = 22)
Age (year)	8.3	8.6	9.1
Male sex	115 (61.8)	10 (45.5)	11 (50.0)
Met KD criteria	74 (39.8)1)	20 (90.9)	19 (86.4)
Complete KD	49 (26.3)	13 (59.1)	11 (50.0)
Platelet count (103 /μL)	133	251	130
CRP (mg/dL)	17.8	9.4	10.1
Initial IVIG	144 (77.4)	17 (77.3)	22 (100.0)
Initial treatment failure (i.e., IVIG resistance)	77 (41.4)	4 (23.5)2)	7 (31.8)
Biologics (IL-1 or IL-6 inhibitor)	38 (20.4)	0 (0.0)	1 (4.5)
Vasoactive agents	90 (48.4)	3 (13.6)	5 (22.7)
ICU admission	140 (75.3)	NA	5 (22.7)
Coronary artery aneurysm (i.e., Z-score > 2.5)	15 (8.1)	NA	3 (13.6)3)
Mortality	4 (2.1)	0 (0.0)	0 (0.0)

Data are presented as frequency (%) or median.
Almost three-quarters (73.6%, 137/186) of patients with MIS-C had KD-like features (e.g., rash, conjunctivitis, or mucositis), but less than half (39.8%, 74/186) of patients met the criteria for KD.
Of the 17 patients treated with IVIG, four (23.5%, 4/17) were resistant to IVIG treatment.
Of the 5 patients with coronary artery complications, three (13.6%, 5/22) had coronary artery aneurysms (i.e., Z-score > 2.5).
MIS-C: multisystem inflammatory syndrome in children; KD: Kawasaki disease; CRP: C-reactive protein; IVIG: intravenous immunoglobulin; IL: interleukin; ICU: intensive care unit; NA: not available.