Table 1 A summary of the inclusion criteria for the meta-analysis and meta-regression

Population

Adults ≥ 18 years

Intervention

COVID-19 vaccine or therapeutic treatment

Comparator

Any or none

Outcomes

Any

Study design

Randomised controlled trial (any phase) with a minimum sample size of 50 and conducted in UK or reporting UK data

Time period

Published in peer-reviewed journal between 1st January 2020 and 4th May 2022