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Outcome analysis using hazard function methodology

E H Blackstone1

  • 1Department of Surgery, University of Alabama at Birmingham 35294-0007, USA.

The Annals of Thoracic Surgery
|February 1, 1996
PubMed
Summary
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This study extends hazard function methods to analyze healthcare costs, including hospital charges and length of stay. These new methods allow for patient-specific cost predictions and risk factor identification.

Area of Science:

  • Biostatistics
  • Health Economics
  • Medical Informatics

Background:

  • The hazard function quantifies the instantaneous rate of time-related events, such as mortality.
  • Existing methods analyze clinical outcomes, identify risk factors, and predict patient outcomes.
  • This research applies hazard function methodology to healthcare cost analysis.

Purpose of the Study:

  • To extend hazard function methodology to the analysis of healthcare costs.
  • To develop methods for analyzing patient-specific hospital costs and time-related healthcare expenditures.

Main Methods:

  • A hazard function approach using a compartmental analogue analyzes patient-specific hospital costs (e.g., charges, length of stay) considering in-hospital death as a competing risk.
  • A second hazard function method utilizes weighted repeated events theory for analyzing time-related healthcare costs.

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Main Results:

  • The hospital costs methodology was successfully applied to length-of-stay data following coronary artery bypass grafting.
  • The weighted events method was illustrated using a prior analysis of variable morbidity from recurrent thromboembolic events.

Conclusions:

  • Hazard function methodology can be effectively extended to analyze healthcare costs.
  • This extension is applicable to both single episodes of care and multiple time-related healthcare episodes.