[Neglected differentiations: Of relative and absolute risk reduction and of seat belts and vaccines].

It is often reported that established COVID-19 vaccines have an efficacy of 70 % or more in preventing serious illnesses or deaths. On the other hand, critics claim that the vaccines have actually shown less than 1 % efficacy in studies and are therefore of little use. Which statement is correct?

And where do these discrepancies come from?