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“When he says "JWs", he's referring to those JWs who live within the area of the four hospitals, even if they weren't actually participants in his study.”
As a general rule I’d have to disagree with that statement. Nevertheless, in this case we have every reason to think severely anemic JWs refusing blood in New Zealand have a reduced mortality compared to just about anywhere else in the world. Yet my conclusions do not take advantage of this to statistically increase mortality. We also have no reason to think the statistical incidents of severe mortality are anyways increased in the New Zealand study at issue (that are left unaccounted for). Moreover, my conclusions assume there was not as much as a single death at any other trauma center in the given region of a severely anemic JW refusing blood. Again this is to avoid anything that would statistically increase extrapolated mortality values.
Marvin Shilmer