The study was not set up to look at any differences between the two. It is an important point but we cant at the moment say anything about that, he said. The Pfizer/BioNTech was available first so there is more data, but the Oxford/AstraZeneca was mostly used in the older age group. The numbers were very small and there was uncertainty over their significance, said the researchers. Sheikh cautioned at a media briefing that the results are preliminary data, yet to be peer-reviewed by independent scientists, but added: I am very encouraged.
Different studies yield uncertain results.
( z0 yield :ARG0 ( z1 study :ARG1-of ( z2 differ ) ) :ARG1 ( z3 thing :ARG2-of ( z4 result ) :mod ( z5 certain :polarity - ) ) )
(z0 / yield-01
    :ARG0 (z1 / study-01
              :ARG1-of (z2 / differ-02))
    :ARG1 (z3 / thing
              :ARG2-of (z4 / result-01)
              :mod (z5 / certain
                       :polarity -)))
Different studies yield uncertain results .
z1 :ARG1-of z2
z0 :ARG0 z1
z5 :polarity 0
z3 :mod z5
z0 :ARG1 z3
z3 :ARG2-of z4