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"The study found vaccine efficacy reached 82.4% after a second dose in those with a dosing interval of 12 weeks or more (95% confidence interval 62.7% to 91.7%). If the two doses were given less than six weeks apart the efficacy was only 54.9% (CI 32.7% to 69.7%)."
https://www.bmj.com/content/372/bmj.n326
That's for AZ. Other studies are available.
jellybaby
There was something mentioned about a bigger gap between doses being more effective.