It didn't show that. It showed 62%. 70% is a pooled result when you put the (too few) people into the calculation who got 90% efficacy, which scientists can't e

It didn't show that. It showed 62%. 70% is a pooled result when you put the (too few) people into the calculation who got 90% efficacy, which scientists can't explain as that testing regimen was completely fucked up by Jenner and AZN (different dosage, different timing, different age group <55yr only). So it's hard to tell if it's really 90% (due to sample size) or WHY it might be more effective than the 62% number. The approvals so far for the AZN/Oxford vaccine have been for the full-full dose regimen, which has shown to be 62% effective only.