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Rows represent the preclassified groups and columns the predicted categories after leave-one-out cross-validation. KD, pre–SARS-CoV-2 pandemic Kawasaki disease (n = 14); MIS-C, multisystem inflammatory syndrome in children (n = 13); COVID, pediatric patients with mild COVID-19 disease without MIS-C (n = 9); HC, healthy controls (n = 31 [53 samples]).
