At least the german Paul-Ehrlich-Institut (which is responsible for the decision here in Germany) states [1]: > "The number of these cases after vaccination wi

At least the german Paul-Ehrlich-Institut (which is responsible for the decision here in Germany) states [1]: > "The number of these cases after vaccination with COVID-19 AstraZeneca is statistically significantly higher than the number of cerebral venous thromboses that normally occur in the unvaccinated population. For this purpose, an observed-versus-expected analysis was performed, comparing the number of cases expected without vaccination in a 14-day time window with the number of cases reported after approximately 1.6 million AstraZeneca vaccinations in Germany. About one case would have been expected, and seven cases had been reported. 1 expected vs 7 observed seems significant. Of course, with tiny rates like that it's challenging to draw a clear conclusion. Their whole FAQ is very concise and informative: [1] https://www.pei.de/EN/service/faq/coronavirus/faq-coronavirus-node.html?cms_tabcounter=3 https://www.pei.de/EN/service/faq/coronavirus/faq-coronaviru...