The performance of standard comorbidity scores to control confounding is poorly defined in health care utilization data across elderly populations. We sought to evaluate and rank the performance of comorbidity scores across selected U.S. and Canadian elderly populations using health care utilization databases.
Division of Pharmacoepidemiology and Pharmacoeconomics, Gigham and Women's Hospital and Harvard Medical School, Boston, MA 02120, USA. schneeweiss@post.harvard.edu
