Rehabilitation and post-acute geriatry is a large field with a large panel of hospitals in France (1800). The French specific classification Groupes Homogène de Journées (GHJ-280 groups), developed in 1996, is neither good enough for easy use in health politics nor for funding. A new case-mix model, based on the same medical dataset and on analytic cost data, has been developed with a very significant improvement in R 2 for cost per day.
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Métral et al. (2008) studied this question.