Characteristic	Medical History					p-value2
	Overall, N = 6571	COVID-19 with respiratory symptoms, N = 2581	Non-specific signs and symptoms attributed to COVID-19, N = 1501	MIS-C, N = 1861	Screening and/or symptoms not attributed to COVID-19, N = 631
No past medical history	371/657 (56%)	129/258 (50%)	94/150 (63%)	120/186 (65%)	28/63 (44%)	0.002
Asthma	39/646 (6.0%)	24/252 (9.5%)	3/150 (2.0%)	9/185 (4.9%)	3/59 (5.1%)	0.015
Other Lung Disease	31/644 (4.8%)	27/252 (11%)	0/149 (0%)	2/186 (1.1%)	2/57 (3.5%)	<0.001
Diabetes Mellitus	5/647 (0.8%)	2/253 (0.8%)	1/150 (0.7%)	2/185 (1.1%)	0/59 (0%)	>0.9
Immunodeficiency	19/638 (3.0%)	11/248 (4.4%)	1/147 (0.7%)	2/186 (1.1%)	5/57 (8.8%)	0.004
Congenital Heart Disease	15/649 (2.3%)	12/255 (4.7%)	1/150 (0.7%)	0/185 (0%)	2/59 (3.4%)	0.002
Abnormal Pulmonary Function Test	4/621 (0.6%)	4/237 (1.7%)	0/147 (0%)	0/183 (0%)	0/54 (0%)	0.2
Abnormal (cognitive) development	63/604 (10%)	33/240 (14%)	10/132 (7.6%)	9/176 (5.1%)	11/56 (20%)	0.002
Other	119/641 (19%)	39/254 (15%)	32/144 (22%)	39/181 (22%)	9/62 (15%)	0.2
1 n/N (%)
2 Fisher's exact test