Relative risk of incident heart failure or death within 90 days of follow-up from admission to hospital for new onset myocarditis in individuals with myocarditis associated with SARS-CoV-2 mRNA vaccination, myocarditis associated with covid-19 disease, and conventional myocarditis (Nordic myocarditis cohort)
| Type of myocarditis | Diagnosis of heart failure (No of patients) | Death from any cause (No of patients) | Total No of patients | Relative risk (95% CI) of heart failure | Relative risk (95% CI) of death |
| Vaccination | 22 | 6 | 530 | 0.56 (0.37 to 0.85) | 0.48 (0.21 to 1.09) |
| Covid-19 | 12 | 6 | 109 | 1.48 (0.86 to 2.54) | 2.35 (1.06 to 5.19) |
| Conventional | 496 | 156 | 6653 | 1 (reference) | 1 (reference) |
CI=confidence interval.