Objective: Nineteen ETL Taskforce members and OHDSI colleagues came together virtually in July 2021 for EHDEN’s first evidence-a-thon.  The premise was running the R packages from the study published as a special paper in the BMJ (British Medical Journal) on characterising the background incidence rates of adverse events of special interest (AESIs) for COVID-19 vaccines in eight countries. This would enable EHDEN Data Partners (DPs) to familiarise themselves with running analyses on top of their OMOP mapped datasets, and for EHDEN and OHDSI colleagues to both evaluate the veracity of those mappings, as well as providing educational support to the DPs.

Conclusions: More details can be found here.