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Figure 26. Predictive model for length of stay for cardiovascular surgery
Figure 27. Average error to predict length of stay
not really have any effective treatment at the time the Charlson Index was initially defined, but which
now has some treatments available so that patients are now living longer with HIV compared to previ-
ously.
The Charlson Index was defined through a consensus process. Its validity based upon evidence has
yet to be established. The standard practice of taking the differential of the actual and predicted mortality,
too, can result in low rankings for providers with very low or even zero mortality; hospitals with high
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