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Some more non-settled science, courtesy of The Ottawa Hospital:
A large Canadian study has shown a link between blood donor characteristics and transfusion recipients' outcomes. This is the first study to suggest that red blood cell transfusions from young donors and from female donors may be associated with poorer survival in recipients.
Guess the old simple classification system of sorting all blood into a couple of types was too simple. Just because blood doesn't cause an instant life threatening reaction doesn't mean it is totally compatible.
And like any good science article, the conclusion is "more research is needed!"
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Researchers Find Association Between Donor Age, Female Sex and Transfusion Outcomes
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(Score: 3, Interesting) by migz on Wednesday July 13 2016, @06:46AM
The thing with statistics is that you need to know what the original populations are that the samples were drawn from.
In this case the populations are the donors and the recipients. Until we know more about the composition of these groups we can't make the kinds of associations made in the summary.
If there are a disproportionally large number of young female donors then I expect this spurious outcome.
I speculate that this could be likely given that recipients of transfusions are disqualified from donating, and that woman are more likely to receive transfusions due to childbirth.