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Age differences in treatment decisions and practices for advanced kidney disease stratified by comorbidity score. (A) Low comorbidity. (B) Moderate comorbidity. (C) High comorbidity. *On the basis of chart review of a random sample of patients who were not enrolled in the US Renal Data System (USRDS) and did not have a dialysis procedure code in Medicare or Department of Veteran Affairs (VA) administrative files during follow-up.
