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Comorbidity and confounding in end-stage renal disease
1Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, 22 S. Greene Street, Baltimore, MD 21201, USA. sseliger@medicine.umaryland.edu
Kidney International
|December 31, 2009
Summary
Researchers developed a new comorbidity index for end-stage renal disease (ESRD) using US Renal Data System data. This tool aids observational research but cannot fully address confounding bias in ESRD studies.
Area of Science:
- Nephrology
- Epidemiology
- Biostatistics
Background:
- Accurate comorbidity adjustment is crucial for unbiased outcomes in end-stage renal disease (ESRD) epidemiologic studies.
- Existing methods may not adequately control for confounding factors in patient and dialysis facility comparisons.
Purpose of the Study:
- To derive and validate a novel comorbidity index for use in end-stage renal disease (ESRD) research.
- To provide a tool for improving the accuracy of observational studies in nephrology.
Main Methods:
- Utilized data from the United States Renal Data System (USRDS).
- Developed and validated a new index to quantify comorbidity burden in ESRD patients.
Main Results:
- A novel comorbidity index was successfully derived and validated.
- The index demonstrated utility for observational research in the ESRD population.
Conclusions:
- The novel comorbidity index is a valuable addition to the tools available for ESRD observational research.
- This index, while important, does not eliminate the challenges of residual and unmeasured confounding in observational studies.
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