From the citation:
“Limitations
These data are preliminary, based on surveillance data, and should be interpreted with caution. The results have several limitations:
While this method has been used to assess risk of death following COVID-19 vaccination,2 it violates the assumption that an event does not affect subsequent exposure (for mRNA vaccines), which may introduce bias.6 Further, it does not consider the multidose vaccination schedule required for mRNA vaccination.
This study cannot determine the causative nature of a participant’s death. We used death certificate data and not medical records. COVID testing status was unknown for those who did not die of/with COVID. Cardiac-related deaths were ascertained if an ACME code of I3-I52 were on their death certificate, thus, the underlying cause of death may not be cardiac-related.
The finding that the Janssen vaccine was more protective than mRNA vaccine against mortality within 28 days of vaccination could be due to confounding and needs to be further evaluated. It is likely that the populations who received COVID-19 mRNA vaccine and the Johnson vaccine are different, something we were not able to ascertain in this analysis. It is possible that the population who received the Johnson vaccine was younger and healthier than those receiving the mRNA vaccines. The Pfizer and Moderna mRNA vaccines were released more than 2 months earlier than the Janssen vaccine when the recommendations were limited to those 65 and older.
“
interesting anecdotal records and observations.