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by dzdt 3479 days ago
That means they adjust for things like that heart attacks in 80-year-olds are more likely fatal than in 40-year-olds, so a hospital serving mostly the former is expected to have a lower survival rate for heart attack patients.

They are trying to measure differences in effectiveness for similar patients. GP gives a possible explanation for such a difference : the hospital probably gets good at the kinds of things it does a lot.