The rate of myocarditis – the inflammation of the heart muscle – was calculated by dividing the number of COVID-19 vaccines in Ottawa by the number of incidences of the heart condition. However, the study has been retracted due to a miscalculation, Reuters reported.
By their calculations, the risk of myocarditis was 1 in 1,000 or 0.1%. However, the numbers used by the study were wrong. The authors largely underestimated the amount of vaccines delivered, giving a number 25 times smaller than the actual amount. They initially said that the number of vaccines delivered was 32,379 – when it was actually 854,930.