According to the data, 3 covid cases out 169 were severe in the placebo group (1.7%) vs 1 case out of 9 in the vaccinated group (11%). This is likely a paradox due to the small numbers but highlights the problem with starting vaccination policies prematurely. 1/2 
There's good evidence this vaccine reduces the Ns of cases but no evidence that it does so for the conditions we are desperate to control: the severe ones. Choosing a vaccine over another has an opportunity cost. Efficacy is not necessarily the best criteria. Choose wisely! 2/2
I should add that another way to look at these numbers is to look at the number of severe cases/number of potentially exposed subjects and that is 1/20k vs 9/20k. However, it is still small numbers we are talking about.
It would be good for Pfizer to release the full description of the cohort by age groups. Table 4 is limited to two age groups.
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