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From Zhang et al 2010 - Quintiles of Performance on HEDIS Measures of the Quality of Drug Prescribing 2007

Geographic Variation in Prescribing Practices

The authors used HEDIS quality measures, and mapped them by hospital referral region. The map above shows variation in quality of prescribing high-risk drugs (medications considered to be high-risk for the elderly), and the map below shows variation in prescribing drugs with potentially harmful drug-disease interactions. NEJM November 2010