Appendix Table 2.

Study Inclusion and Exclusion Criteria

Inclusion Criteria - Status: Inpatient/Observation (included ICU admission) - Age: 30 days – less than 18 years old - Primary diagnosis of COVID-19 (ICD-10: U.071) with any secondary diagnosis - Secondary diagnosis of COVID-19 with primary diagnosis of a COVID-19 complication

Exclusion Criteria - Newborn who never left the Hospital - Diagnosis of Kawasaki Disease or MIS-C (ICD-10: M30.3, M35.8)

Abbreviations: COVID-19: coronavirus disease 2019; ICD-10: International Classification of Diseases, 10^th Revision; ICU: Intensive Care Unit; MIS-C: Multisystem Inflammatory Disease in Children