Persistent inconsistencies in patient cost variability within the French DRG classification system over the 2012-2019 period.

For each model, the Hausman test yields a highly significant result ( p < 0.001), indicating that a fixed effects model is preferred over a random effects specification.

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The analysis further revealed a positive trend in the number of THP (total hip replacement) patients discharged home after undergoing surgery [ 34 ].

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