The report cites Clinical Professor James Isbister from the Sydney Medical School, University of Sydney. “Professor Isbister said Jehovah’s Witnesses were given better treatment by doctors trying to preserve their [the Witness patients’] blood. As a result they had better survival rates, and shorter hospital and intensive care stays than people who received blood transfusions during surgery,” reports the paper.
I don't see how they could limit the conclusion to just blood transfusions. JWs tend to live a very healthy lifestyle in general (diet, activity, community).
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[ 2.6 ms ] story [ 17.9 ms ] threadhttp://www.smh.com.au/national/health/surgeons-urged-to-avoi...
We used propensity methods to match patient groups and parametric multiphase hazard methods to assess long-term survival.
Looking at the full text, they matched the Jehovah's Witnesses with patients that had similar health profiles prior to the procedure.
I am not qualified to say anything about whether what they did has any validity.