Table 2. Clinical characteristics and organ involvement of MIS-C with or without hyperferritinemia

	MIS-C with hyperferritinemia (n = 11)	MIS-C without hyperferritinemia (n = 11)	P value
Clinical
Age, year	9.1 (4.1–16.0)	9.5 (0.9–12.0)	0.669
Male sex	5 (45.5)	6 (54.5)	0.670
Length of hospital stays, day	10.0 (5.0–18.0)	6.0 (4.0–15.0)	0.072
Fever duration, day	5.0 (3.0–15.0)	5.0 (3.0–10.0)	0.917
Skin rash	7 (63.6)	10 (90.9)	0.311
Met KD criteria	10 (90.9)	9 (81.8)	1.000
Complete KD	6 (54.5)	5 (45.5)	1.000
Organ involvement (see Table 1)
Cardiac involvement	8 (72.7)	4 (36.4)	0.198
Mucocutaneous involvement	11 (100.0)	10 (90.9)	1.000
Shock	6 (54.5)	0 (0.0)	0.012
Gastrointestinal involvement	11 (100.0)	9 (81.8)	0.476
Hematologic involvement	10 (90.9)	7 (63.6)	0.311
Others: respiratory, neurologic, or renal1)	8 (72.7)	6 (54.5)	0.659
Number of organs involved	4.0 (2.0–5.0)	3.0 (2.0–4.0)	0.002

Data are presented as frequency (%) or median (range). MIS-C: multisystem inflammatory syndrome in children; KD: Kawasaki disease.
The Council of State and Territorial Epidemiologists/Centers for Disease Control and Disease Prevention (CSTE/CDC) case definition includes five types of organ involvement (i.e., cardiac, mucocutaneous, shock, gastrointestinal, and hematologic). Other organ dysfunction (e.g., respiratory, neurologic, renal, or musculoskeletal) is not included in the CSTE/CSC case definition.