Relative risk of readmission to hospital for any cause within 90 days of follow-up from discharge 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 | Readmission to hospital for any cause (No of patients) | Total No of patients | Relative risk (95% CI) of readmission |
| Vaccination | 62 | 530 | 0.79 (0.62 to 1.00) |
| Covid-19 | 9 | 109 | 0.55 (0.30 to 1.04) |
| Conventional | 988 | 6638 | 1 (reference) |
CI=confidence interval.