Anxiety over the vaccination itself is believed to be the cause of the vast majority of side effects experienced among those vaccinated against the novel coronavirus at a mass vaccination site in Tokyo, an analysis by the Self-Defense Forces Central Hospital has found.

About 90% of the acute-phase side effects experienced by 2,930 people after receiving the vaccine at the Defense Ministry-administered vaccination site were believed to stem from stress accompanying anxiety over the vaccination.

Those in younger age group made up the largest share of those affected, according to the analysis carried out before the site in Chiyoda Ward, Tokyo, is scheduled to close at the end of this month.