CDC Study

SARS-CoV2 infection based on presence in hospital for any code
Vaccine-induced myocarditis based on specifically recorded incidence

Nordic study

Larger pool of data
SARS-CoV2 infection based on hospitalization for SARS-CoV2 infection
Myocarditis incidence rate far lower than what was reported by CDC
Still impossible to gauge the real rates of cardiac/pericardiac events